Some people get divorced for that reason, but its pretty supreficial and shallow. Would you really want to stay married to a person who only saw you as a cash machine?
As a woman, I think he made a mistake.
If she'd divorce him because he doesn't make enough money, she' s a phoney and not worth having. He should find someon who loves HIM
If she's asking uncomfortable questions because of the beliefs of her friends, they should sit down and talk things out, coming to a resolution they both can live with
His mistake is telling her not to see her foolish friends. Some women are obsessed with money, and that can be a problem, but they're not worth having.
All women, on the other hand, like to have control of ther own lives. If he tells her who she can or cannot see, this creates a grievance which could, with other things, lead to conflict in their marriage and divorce. If he explains why he's concerned about them, she may see his point and decide to stop herself, but at least she will now be aware of how her friends' greediness is creating problems in her marriage