Either you do this or else something unpleasant will happen to your career.
The ones that said "no" had unpleasant things happen.
They learned the brutal truth that it wasn't their career. They also learned the ugly truth about themselves about what they were willing to do because they didn't want any other career.
They learned that they didn't have family nor friends who would have steered them away from that path, starting when they were very young. How many mothers, knowing what the casting couch was, still sent their daughters into Hollywood?
Historically, society looked at actors and actresses the same as prostitutes.
I guess I don’t think actor or actress is really a career one can plan on.