I think some of them avoid certain questions. It is very difficult to get an answer when you ask a question that is a tad critical and actually has some meat to it even when it is asked in a nice way, especially when it is asked in a nice way. If you just ask something like "hey Christians, what's wrong with you?" You'd get a ton of answers. But ask a valid, well worded question and you will get 3 answers (2 of them being non-answers). There are some Christian regulars who don't shy away from difficult questions and I've learned to save those questions for times when I know they're online.