Hey :) Not meaning to start a feud or nothing, but I think 'Just Have To Get Hit' is a good enough arguement. Basically, (and I apologise if this wasn't clear) your opponent, by attacking you, gives you the boost. So, rather than using 2 turns to set up, you only require one. Think about it, +2 Atk, +2 Spd in one turn. Pretty good eh? And that's one turn less where your opponent can try to do something about it.
Anyway, that's my view, I appreciate it if you have a different one :)