I don't think most of them do. If I had to guess:
1. Akasha's played before, but certainly not much
2. Keaoden's played to some degree, but not to the level of insanity, or else played quite a bit but hasn't in years.
3. Pozf's played, but I already knew that
4. Churba may have played, I'm not certain. But he has some exposure to the game somehow.
everybody else hasn't ever played, except Selan, who played the once.