Doesn't have to be like the Guru Cup with real-life prizes, can be small scale ATs with just more RPs than standard as the reward (less than mAT). I'd say once every two weeks is good. To go with these tournaments, add some tournament rules. These don't have to be complex either and need not include any updates from ANet, e.g:
All players must use Survivor or Radiant insignia
All teams must run honor balanced (Evis + Dev Ham + PBlock + MoI + Cripshot + WoH + RC + Spirit Channeling)
No Monks
Tyrian skills only
And so on.
J


