Nathan's Hot Dog Eating Contest

I just saw Kobayashi win the the Nathan's Hot Dog Eating contest on ESPN for the 6h straight year. He broke the world record by eating 54 hot dogs and buns in 12 minutes. This years race was tight with Joey Chestnut challenging him right to the very end eating 52 hot dogs. I am really amazed at the weird sports around and that their is a MLE...major league eating. These guys not only eat hot dogs and hamburgers but weird shit like "corned beef and cabbage" eating competition. How much do these guys make? How do you train? Do they vomit after each competition because most aren't that fat...so weird.