Crazy bets by pro gamblers

I have heard of these bets made by and amongst pro gamblers like, 1. paying Howard Lederer, who is a vegan $10K to eat a cheeseburger. 2. betting that John Hennigan couldn't live a month in Des Moines, Iowa.
I don't get it, these seem to me easy ways to make money, I doubt it was that hard for Lederer even after years of being a vegan to eat a cheeseburger for TEN GRAND. Is it really worth ten grand to the people that made the bet to have hennigan live in Iowa for a month?
Thoughts?