Well, the folks at Leprecon in Phoenix have invited me back next spring. They were really nice to me last time I went. So few cons ever seem to want me. Of course, with my work schedule, attending these things is tough--especially in the winter. It's almost impossible to get weekends off.
I know people who go to practically every con they can get to. It's expensive going to these things.
Anyway, I don't have to worry about getting time off for cons as so few of them ever want me. I've been on a three con rotation, so one about every 4 months is it for me. I don't expect that to change much in the near future.