Ad revenue reference:(http://www.trefis.com/stock/fb/articles/216618/maryhow-fa...)$186k of revenue per year is not much to run a business with. I don't think it's polite to speculate what Marin makes, and I have no idea the cost of servers in an inexpensive market, nor do I know any of the other misc operating expenses. But to me it's been clear that at 31,000 users, it's a business model that might be self-sufficient, but is hardly making anyone rich.
Perhaps the same thing as it is in Hattrick. When you don't extend your Supporter, one more week you can have it, but you are not able to log in. If the time runs out and you don't extend your Supporter, you lose your second team. Personally, I like the idea to give supporters a second team, this way BB would attract more users and.. Well, you said it all. Great idea.