The users used to be altruistic, helping other people just because they wanted to be friendly. Because the site used to feel like a real community. But, now that the site is so clearly for-profit I think a lot of users are going to be much less helpful to strangers.
It’s hard to quit the site because it gets so much traffic, which means so much stuff gets posted there. On the other hand, I think the high-quality comments from someone trying to help out are less common.