Every night for the past week I have walked into cnet cantina, playedthrough a quickness buff, and made from 80k-300k in tips. There are buffbots in the cantina but I seem to win out on a nightly basis.
Here is what I do and hope it helps some live entertainer buffer's =). (Granted Buffbots could adopt some of the methods, but you just can't beat entertainment.
1. Setup
a) Find a corner in the cantina, preferably in plain sight to would-be buffers.
b) Plop down a nalargon. These attract people. They do not have to look for a master musician tag, and they stand out more than anything else, except for...read on.
c) Under you, and hidden by the nalargon, get out a droid, effects or playback, and group them. Make the name obvious that they are a part of your show. Example: My droids are named 'Pyro' for effects, and 'Bass' for playback.
2. Macro's
a) For the macro to buff, I suggest Fragpuppie'sQuickBuff(tm).
2. Basically flourish 5 times within 5-8 seconds for a less than 4 minute buff.
b) /shout. Make this a macro if you wish, but for the love of God please do not make it recursive. Do it every now and then. I basically think: Ok someone just landed and read that shout, given lag, it will take them 4-5 minutes to get here, anticipating they are talkign to people on the way, stopping by bank, maybe getting a doctor buff if no line, etc. Give an extra minute or two lol...then shout out again.
c) /group macro. I do have a macro which i hit every time someone joins group to tell them how much, mine is "/g no charge, tips accepted, yes nothing is acceptable, no I won't hold a grudge if you don't, and wookiee's are free...as always" (I'll go more into charging later) I also make a macro with same message but as "/reply..." for when a person sends tell asking how much.
d) Pyro's. I have made a macro for the pyrotechnics we can do, though I do not often use it. Only when in a good conversation I will feel will be ongoing with group and spatial area.
3. Time's
a) I am a master dancer in addition to music, but I do not often go into dancing buffs, usually only for guildmates and for recurring customers as a "bonus", not in addition to charge. I will find another live master dancer and make an agreement I will refer to customer's I am buffing to him/her after music buff is done, and him/she their customer's to me. This increases your reputation, spreads out the love to live entertainers, and can make and enjoyable area of the cantina of true entertainment.
b) I use FragpuppiesQuickBuff. But I give 4-5 minute buffs even though they may take 3:10. This is for the entertainment value. In the heat of enjoying the area I have often forgot the time and the customer does as well, for everyone is having a good time. I do keep time's however I have never once received a time question or demand from a customer, despite never telling a person to /stoplisten before 4 minutes is up.
4. Music / Instrument Choices
a) Playback Droid. I have an R3 adv. droid with 6 playback modules. Songs set for me include sw1, sw2, sw3, ceremonial, ballad, and virtuoso. Yours can very to your favorites of course, mind you the customer's collective favorites are more important. All the songs are bandfill chorus tunes. Need bass =)
b) I usually have ballad going, its the easiest on the ol' ears after 3 hours of buffing folks, the customer's like its relaxing melodies, compare to the sw1 noise of ent grind groups they just got BF healed at. Or sw1 (with mando) always brings love form my patrons.
c) But always when not in the middle of a buff I ask my customer(s) if they have a preference for song / instruments
d) I traditionally use my mandoviol. With Ballad if I have the time inbetween buffs I may go to my chidinkalu horn.
e) Note: You have your nalargon out already

While this is always an option to use (while using /invite technique) in groups, I use it more for attention grabbing, and hiding the bulky R3 droid.
5. Effects
a) My effect droid, also an R3 adv. droid with all 6 effects and the common 10 spots, is mostly set for foam. Foam is an oldie but goldie if you will, is common, but an eye grabber since so conflicting to the drab colors of cantinas. The other special effects should not be so constant, or else it can 1) lag; and 2) decrease the speculation factor.
b) The 1st, 2nd, 3rd, 5th, 6th, 8th, 9th spots I'll use foam. On the 4th spot I'll use Avian; 7th I'll use Dancing Jawa's; 10th I'll use Electric Fog. Sometimes I'll use Confetti or (can't remember other), but I just like those main 4 mainly.

6. Charging
a) Upto you mainly.
b) For competing against buffbots you should inspire customers to see you though. Buffbots require credits, but patrons can get away for free if an AFK'er. So charging is moot in my book. More importantly you can provide entertainment over buffbots, making the must wait 3-10 minutes time period enjoyable, rather than necessary and a means to an end.
c) Like I said above, I do not charge at all. Plus I provide incentives, such as advertising Wookiee's are free always. (Ironically Wookiee's are my by far, best tippers, and although that is not why I say that in advertising, to get money, it still occurs.) If someone is plainly rebel, I often tell them the buff is free of charge. They still tip mind you, but I would happily buff them again the next day if they did not.
d) I tend to receive 5-10k every person. But I never have set up a charge. Here is my thinking, which I have posted before, and it is a very good analogy and very applicable.
In a restaurant, for a 15 party table, the restaurant (or waiter(ess)) often puts an 18% surcharge on the check for a tip to be ensured. The party pays the check almost always (tip included, no extra). In my experiance when I waited tables, the times I did not put the 18% on the check, I normally received upwards of 30-50% tip of the total. Way more money. While not always true every time, after 5 eight+ person tables I had made more in tips than another waitress using the 18% surcharge method.
If I charged 10k every buff, I would recieve 10k almost always. I don't charge, and most of my buffs seem to be always 15K plus. Those who do not tip, almost always come back, and eventually tip a collective whole to all the times they have come, making the 50k-100k tip not rare.
7. Logging On
a) Not a must, but it has really helped me to play SWG, or play my entertainer, at the same times everyday. I looked at the buffbot user's explanations of the why they go see a buffbot...."Because when I play I know that buffbotter is there, no hassles, and I get what I want with no fuss and in prompt fashion". Now apply this ideology to yourself...I am on and in the Coronet Cantina everyday from 9pm-11pm or 12am EST everyday. So my regulars who play then, and more and more everyday they see me again and again, can apply the same ideology to ME, not just the buffbot, and I provide them the rare commodity of Entertainment. =)
When I buff people, its not me setting out to buff specifically. But buffing is a part of my entertainment package I provide to the patrons of a cantina that come to get healed. If I randomly invite a person listening to me to heal BF and wounds, and they accept i say "While you heal up you minus well get a buff, on the house, in the meantime." So when they do come back to specifically get a buff, I am on their list of who to look for, and they know the 5 minutes spent won't be a necessity, but a time to enjoy themselves and kick back. A sign that you are indeed an entertainer is when you eventually get more than one tell or email saying "You know, I meant to go outside to have a smoke during that buff, but dammit!. I forgot to...thanks again for the buff, was fun=)".