I had add few but then it's not just the Q&A. I read the profile,etc and talked to them too before I added them.
Yes. That's part of it.
I've been tempted, but no. I don't really see the point.
Answers, questions, groups, stories, friends all come into play when accepting someone into my circle.
No, but I sometimes look at their profile.
Sometimes. Especially if they are exceptionally witty or intelligent responses.