It is not about being successful. It is about having fun and playing games as a community.
Nope. Steam Credit only sorry.
Here is the results of the survey I asked (without the single player games and games only 1 person had):
Screenshot from 2013-07-07 02:04:30.png
The free games (that anyone can play) are in orange.
Edit: Updated rules, Tourney will start July 15.