A good article on what beer vending entails. From the article:
A top-flight concessionaire might make $200 or $300 before tips. Full-timers--who work multiple sports or different venues--can take home more than $40,000 a year.
I'd like to try out beer vending for a game. Lugging all those bottles up and down the aisles. Telling people how bitter and sweet an ice cold beer would taste alongside that there hot dog. Explaining how you notice so many more hot chicks when under the influence of about six ice cold Coors Lights. That's the life.