“The uptick in state examination of the issue coincided with the beginning of football season when the ads became nonstop,” said Jonathan Griffin, a gambling specialist for the National Conference of State Legislatures. Of that, the sites will keep roughly 10 percent the rest will be paid out as winnings. Players will spend more than $3 billion this year in entry fees, said Chris Grove of Eilers Research, a gaming-industry market research firm. The daily sites, an Internet outgrowth of the rotisserie sports leagues of the 1980s, emerged in the last few years and took off this year amid massive ad campaigns. But other states, such as Colorado, Delaware, Georgia and Illinois, are interested, too. Pennsylvania and California are leading the way. But many more states are working on legislation for upcoming sessions that would subject the games to oversight or licensing. New York and Nevada have banned the sites, labeling the games illegal gambling - rulings that the sites are challenging. Now, states are trying to figure out how to regulate and possibly raise revenue off the exploding industry. If you have been near a TV set in the last three months, you are almost guaranteed to have seen ads from daily fantasy sports websites like DraftKings and FanDuel about how “easy” it is to make money.