If you really want to do the wave, do it in between innings as an "activity".
It bothers me when people are doing it during the game just because their attention span is short. It personally annoys the hell out of me when I'm trying to watch the game, and the morons are standing up blocking my view whenever the wave comes around. The same goes for the beachball hitting too. Let me enjoy my game, food, and beer in peace without having to worry about the beachball spilling my drink over yeah?
I can see for some people, I'm clearly asking for too much. People can do whatever they want, just know that they're an idiot. *Shrug*