I recently did a bunch of research on this for my company Fanvibe. eMarketer, a research firm, estimates fans spend $500mm on premium content about fantasy, bu

I recently did a bunch of research on this for my company Fanvibe. eMarketer, a research firm, estimates fans spend $500mm on premium content about fantasy, but the Fantasy Sports Trade Assoc. estimates the economic impact is about $4bn - the difference being people gambling "under the table". Look at what Fanduel is doing with regards to managing leagues and bets, and taking a cut.