i know where i can find (most) information, but that doesn't mean i'm not going to ask - after all, that information might be useful to other people, and if i ask, it makes it more searchable on the web in general. sometimes, i'll ask opinion-related things though, cos i'm nosey and i like to see how other people think, even if i don't always agree. i think i've asked a fair amount of questions (494, compared to 3059 answers) certainly more than i thought i had in me!
it's up to people to use the site, or not, as the case may be. personally, i'd rather they stay schtum if all they're gonna do is ask homework questions otherwise...