In 2007, Kim Kardashian was working the register at her family's clothing store. Today Forbes says she's worth $1.9 billion, and the reality show that made her famous barely moves that number. The show almost never happened, either. TV producers passed on it because they figured the family had no real talent. Ryan Seacrest had a tape of them hanging out at a Sunday backyard barbecue, and when the producers said no, he went over their heads to Ted Harbert, who ran the Comcast division that…