I paid $100 for a lesson from Ron Convers last year at worlds before it started. It really helped me out a lot on throwing. The issue was he forgot to teach me the basics, you know little things, like, have your bag of discs, have shoes not sandals to play in, make sure you can get to the course in your car on time.
One would think that paying for lessons he would have gone over that. Unfortunately he didn't and that is the reason that I played the first round of worlds with sandals, discs found on the hotel floor, and barely took a ride to be there in time to start it off.
Of course it does make for great memories of the worlds. Almost as good as the one that I played in a dress shirt and tie in protest of the silly "collar required" rule enactment of 2004 in Des Moines......with my computer case as my disc golf bag, which looked sillier?