QUOTE (Bombn @ Oct 11 2009, 12:54 PM)

PGA "Professional"
Professionals (no matter what the industry, like your doctor, lawyer, accountant) don't require tips.
That is a bunk blanket statement. I used to be a "professional" rock climbing guide. All the guides accepted tips (like every climbing guide everywhere), but precious few clients offered them. Our shop also had "professional" fly fishing guides. They accepted and almost always got generous tips. Not sure what the disconnect was there -- maybe client demographics.
Is teaching golf somehow more "professional" than teaching rock climbing? I seriously doubt it -- at least if you teach golf poorly...the client is not likely to later get killed as a result!
I don't accept tips as a "professional" software consultant. Duh. Comparing a doctor or lawyer to a golf pro, re: tips, is asinine. Among other things, you normally don't seek their services unless you have no choice (it may feel like that sometimes with golf, but it is not the case). I did once buy a lawyer a very nice bottle of wine though, because she did a great job for next to nothing.
It's not a matter of "professional" or not. It's purely a cultural thing, arbitrarily dictated by tradition. Tips for instruction in sports/hobbies is common (private ski lessons, etc.). The OP's question is a wise one to ask, if you're not sure. I will say that if a golf pro turned my game around enough in a few lessons...I'd insist on tipping, even if it were just a few beers in the clubhouse or so.