No we haven't considered it directly. We've had a lot of trouble figuring out how to price things though. An unlimited plan sounds like a pretty good idea.
I think you would be better off charging $20 to host a game of up to 50 people. $2/person just seems really high to me. It's gotta be relatively cheap for the organizer to take money out of the pot and put it towards your site.
edit: Read the article... you seem to be getting a decent amount of business, maybe it's worth charging significantly more for an unlimited option. It's certainly a hard service to price.
