I guess there's also the issue of it being not appealing to me and my tendencies. I tend to project a lot of my preferences on the readers. rolls eyes
The thing is, it'd be harder to do a character Q&A(have the characters answering reader questions) in your format, I feel. The impression I have is that that particular type of a Q&A requires a larger format. That's just my instincts speaking, at any rate.