Well, I’ve never waited on tables. But I have driven a delivery truck all around the provinces of Ontario (Nakina, Geraldton, North Bay, Ottawa) and Quebec, (Quebec City, Montreal, Amos, Maniwaki), and as far south as Piqua, Ohio. So far my total gross pay for work related to my field of study, theology, has been $21,600–or less than the cost of my first-year at Cambridge.
The Chronicle of Higher Education has an article about how 17 million people with a college education are doing menial jobs. An astounding 8,000 PhDs in the US are are working as waiters and waitresses.