Re: how many games?
The exact algorithm is a closely guarded secret (jase hasn't even told the mods), but it seems to be based on how long you've been here, how many games you run, how many games you have deleted, duration and post counts of active games, numbers of players, etc...
Basically, the longer you stay here, the more active you are, and the more successful your games are, the more games you can run.