This is anecdotal, but my elementary school class was full of doctors kids and I can tell you that the doctor parents would almost disown their kid if they didn't get into medical school. Doctors seem to have a very strong opinion on the medical field being the only right option.
So in that sense it's more of a correlation with money, and a causation through inheritance.
In my case.... my dad is a doctor and it was sort of expected I become one myself. Its not my thing though, or it wasn't at the time so now (like a lot of people on this forum) I work in engineering. In a way I do regret it now, because I wish I did something "useful" to society.
My younger sister however, did go to med school and is about to finish. She was very driven from a young age - I don't remember her saying she wants to become anything else but a doc. When her and my dad talk, I feel a little left out and only occasionally I have the feeling they look at me and shake their heads.