A booth at the Fit Expo can cost close to $2,000, although there are way of reducing that, especially since Jay Cutler did a seminar there on Sunday on the center stage which attracted a ton of people, and provided good info with Q&A.
He can earn quite a lot, depending on who buys what from the booth (T-Shirts, DVDs, pics). Cutler is one of the best 'business' minded individual in the sport, and has the respect of many in how he does business. He also is sponsored by some other companies, include Smart Shake, which he went to their booth for a while too.