I tend to answer a lot of questions here, and I have at least not been informed of this supposed conspiracy.
Stack Overflow is pretty much the only other site in the network I've been active with, and they receive a huge amount of questions. I use the same approach here, that I have found working for me there: if I ever need to ask something, I do, but it's usually a rather last effort, long after google and wikipedia has failed me; as for answering, I try to contribute whenever I can. If I don't know the answer to a question, but I find it intriguing, I might go ahead and do a bit of research myself - that's great, I'm learning something. I find that I'm learning most, however, by answering people, because it puts my own thoughts to the test, and I'll see when other people come up with better ideas, or correct me in comments. That's really all that's in it for me.
I can't know, of course, if the people aksing the questions really didn't know the answers themselves. Sometimes the questions seem to imply that the guy writing them has a pretty good idea. When the question is pretty much just saying "Hey, you guys, I think it's like this amirite?" That's completely fine by me! So perhaps they do have an idea, but want to get it confirmed? Perhaps more likely, they might be pretty sure they're on the right track, but want to see what kind of arguments other people use to back that up.
In Stack Overflow, which is a programming site, it's really easier to just accept an answer and move on. Oh, so I had missed a semi-colon? Ok, thanks you guys, that solves it. Here, we're all skeptics, and for the most of us, it isn't enough to simply know something for ourselves, we actually want to be able to test these theories in debate, and as such, we enjoy gathering as many different arguments as possible. Something that doesn't often have a counterpart in programming questions, but that I still think fits this forum very well.
So I really don't mind those questions at all. What I have seen, though, is a few questions that are pulled verbatim from Skeptics Exchange, or questions where the original poster publishes the answer himself, pretty much immediately. As if to contribute to some kind of knowledge base, perchance. I don't quite know what the deal is with that. To me, the only incitement to post a question should be an actual interest in input from others. That doesn't always have to entail having no clue what so ever what the potential answer might be, though.