“I know a number of people who married for money when after the marriage either they lost their money, which made the person feel all the goodness of the partner was gone, so they divorced, or they were ruch but did bot share the money with the couple, again resulting in divorce.”
The other spouse can and should refuse to give/accept a divorce in such a case. This is precisely a case where it would be entirely justified to use the perogative the Torah gives to decline divorce.