Remember, you're talking about a multi-billion dollar industry, here. Even getting a job on a soap commercial is tough. Actors have got bills to pay.
Those failed waiters? That's not the path they intend to follow. Now that the vaudeville circuit is gone, it is harder and harder for unemployed actors to find work in that field.
Many finally give up and use their success to launch careers in other Industries. Cooter from The Dukes of Hazard and Gopher from The Love Boat launched successful political careers. Same with Reagan and some bit part actor named Trump ???? Acting is good training for political careers.
That failed waiter? He's doing what he needs to. When I did stand-up, I had a lot of other "day jobs" as well.
If you're a businessman that has to deal with these waiters, by all means, check their references. Your choice, do you need extra help for the season or are you looking for permanent staff.