Unless there's a very good reason for not doing it, I always pick the BAs for my questions. Sometimes they're the funniest ones,sometimes they're the most informative/insightful ones, and sometime it's h3ll trying to chose one because they're all so good. Some people already have a BA in mind when they're asking the question. I don't look at answering questions as a contest, although I must admit that I like getting BAs. I guess that you sometimes have to think 'out of the box'.
Maybe you're schizoid. I am.
Everything, just about everything.