I have no idea how many there are. But there is an ESPN documentary, I forgot the title, about suddenly rich pro football players who quickly go bankrupt. They spend the money on parties, cars, lavish gifts, and suddenly the money is gone. Then they age or injure out of the game, and spend the rest of their lives in regretful poverty.

Why would suddenly famous actors be any more savvy?

See the documentary "Val" on Val Kilmer.

> Why would suddenly famous actors be any more savvy?

Despite what Hollywood would have you believe, Hollywood is not exclusively populated with rich and famous celebrities.