hmmm..not a good idea. There will be too much issues and complication. Bitcointalk is one of the oldest and biggest online forum in the web and no one owns this. There will be war between pioneer and old members here as to who will manage the "business" and members (from newbies to heroes/legendary) will be much demanding since there will be fees and they know admin and moderator are earning from activities here so it will be totally fiasco.
And do you think, members here will just let Theymos or any member here handle the business knowing it can (and absolutely will) earn substantial income? Nope. So it's a bad idea. As you know, things are different when money involve.