I have a feeling that BigSky's initial point may have been lost among all of the arguing here. I don't think he was trying to say that pro disc golfers aren't good, but rather that the sport is such that the mortals are likely closer to the heroes than in other professional sports. This has to do with more than just scores - it's not like Joe Golfer off the street gets to play on a mixed card with Tiger Woods, so the physical proximity to the players may have something to do with the sentiment. The size of the sport and the ability of anyone to play at the pro level if they so desire has something to do with it as well.
In short, no one is arguing that there isn't a sizable gap between average disc golfers and pro disc golfers. But it is reasonable, I think, to argue that the gap is perceived to be smaller than it is between me and my buddies playing mud football and Peyton Manning.