I think the prize support Needs to be upped. I can only recall Magic online's prize support of the top of my head right now but from what I remember of the other online ccg's or cmg's I've played they were a bit more generous than Magic's more or less.
So right now the 4 man drafts consume 2000 gold and give out 180 gold in prize support thats 9%. Domain Keep has 6 players right now so 3000 gold and is giving out 504 gold, thats about 16%.
Magic Online regular draft queues gave back about 40% ,while its regular constructed queues gave back about 70%. From reading the wiki it looks like constructed and non keep
limited leagues beat the 70% it even beats online pokers 95% prize support
Babbled on too long, anyways I think the prize support for keep needs to be upped. If I'm missing something someone fill me in.