Spammer pay thousands of dollars for fresh emailing lists, simply because enough uneducated people will get cough in their nets. You think they won't be able to afford $50?
Ultimately, its up to Dalton and his executive skills (is he going to be the CEO?) to build a company's structure and split the fee the smart way (have a decent anti-spam team) to keep the site fun and clean [of spam].
True, that alone might not do it. The $50 paired with a rudimentary reporting system might limit the use of a single account to a small time period in which the ROI wouldn't be worth it.