1. I don't think so. My fans seem to be so extremely well-behaved that I'm hardly aware of their existence... assuming they do exist, of course.
2. Not recently, alas.
3. Occasionally; mostly at cons.
4. Myriad reasons. One is that I doubt I'd handle the stress particularly well, and most of the rest are economic.
5. I've had a small number of people put their hands up, and a larger number ask me when the deadline is for abstracts.