My only quibble with this, I don't think you can always reduce the reasons why a model leaves modeling just to poor intelligence and mental health issues. Not every woman who chooses to do modeling actually wants to have a modeling career. Priorities change. Maybe she only wanted to get enough money to pay for school, bills, debts, etc. Once she did, she got out. Maybe she got into a relationship with someone who does not feel comfortable with her doing topless/nude modeling. Maybe she just got tired of modeling and wanted to have a normal life. Maybe she got pregnant, had a kid, and couldn't get her figure back. There are so many reasons why a model would leave a modeling career that are legitimate and not reducible to just she is stupid or she is wacko.
And the fact is, most of us are not privy to those reasons. When we read about why a model quits on the internet, it's usually just hearsay or pure speculation and not the true reason.
Do you know for a fact that most models do quit because they are stupid or are wacko? Have you personally be in contact with these models that mysteriously disappear from modeling? Or did you just read what some "fan" wrote on board on like this one.