Agree with the above, with the exception of summer work which is unrelated to what they make from being professors. If you are a college professor and need to keep a second job to keep the roof over your head, then I think the point stands.
This is not exactly accurate. There are vending machines in the states which produce full cooked products. I’ve mostly only seen them in Airports ,and they generally cost more than a comparable meal at an actual airport restaurant .