World headquarters for the daily fantasy site Draftpot is a bedroom in a New York City apartment a few blocks from Columbia University.Joey Levy and his two fellow Draftpot co-founders sleep in the apartment, too, making for an easy commute.“It’s very convenient and very cost effective,” Levy said. “And it allows us to work day and night.”The story is a familiar one: College student with an idea creates a website and the money starts rolling in. Draftpot may not be the next Facebook, but in …