Daily fantasy sports and compulsive gamblers may not mix

The surging popularity of daily fantasy sports (DFS) sites such as FanDuel and DraftKings is raising concerns among organizations that work with compulsive gamblers.

Unlike traditional fantasy games that last for a season, DFS games provide weekly and sometimes daily payouts, which make them enticing to many players. Though exact figures aren't available, the self-help groups say they've been in touch with individuals who have overextended themselves from wagering on FanDuel and DraftKings.

Experts worry that the problem will get worse if these games keep gaining popularity. The DFS industry will collect $3.7 billion in entry fees this year, skyrocketing to $17.7 billion by