The Community of Disc Golfers and About All Things Disc Golf
"The sport started with hitting a target area on an object to hole out. The spirit of that concept is now better reflected with the rule update for 2011. The only reason for the basket invention in the beginning was to confirm that shots have hit the target in the case the shot wasn't seen." - Chuck Kennedy
In other words, if you don't hit the target area on the basket, and instead stick a wedgie or a shot on top of the basket, then you would not have hit the target area in the original game of disc golf before the baskets were invented. Seems logical to me.
"Who takes the game that serious that they're worried about losing by one stroke to someone who get's lucky."
The pros and others playing in tournaments. If you and your friends want to say that anything supported by the basket counts during a casual round, go right ahead but there needs to be some continuity in the rules for tournaments. It's not that hard to just put the disc in the basket. By the way, how often do you think you'll lose by a stroke if you can't count your wedgie or the shot that lands on top? That's just as rare as losing to someone by one stroke because their wedgie or shot on top did count.