I agree with most here, this really only applies to raiding - anything else it really doesn't matter how you play - whether it is a 1k dps boost or not matters little in a dungeon or while questing. But, raids have raid leaders, other players are all depending on you to do your best - and research where research is needed.
But otherwise, play how you like - you are right it's just a game...

but raiding is srs biznes.