I'd many times thought about what the financial statements of BB looked like, but then again I'm a finance dork, so I thought I was the only one... but my thoughts:
Supporter Revenue: 39.99 x 31,000 users x an estimate that 10% of them are supporters = $124,000 per year.
Advertising Revenue: Facebook's annual advertising revenue per monthly user is estimated at $5.70 in 2013. In 2008 it was $2.68. While I know BB isn't Facebook, it has some similarities of users logging on frequently and spending time on multiple pages with each login. FB bombards users with ads though, and advertisers on FB know they're getting much more exposure than 31,000 users. So, let's estimate that BB's ad revenue is less than FB, but we'll give BB an optimistic guess of $2.00 per year per user. 31,000 users x $2.00 = $62,000 per year.
That's quite a difference. $39.99 of revenue for Supporters. Maybe only $2.00 of revenue for non-supporters.
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.
Now, increase users, and increase the % of supporters, and the business could start making some more money, and be a nice supplemental income for the owners. Which is why I think it's the BEST BUSINESS IDEA AROUND for the BBs to allow Supporters to have a 2nd team. Others have already addressed how to design it to prevent cheating. I think you easily double or triple the amount of users purchasing Supporter if you can start a 2nd team.