I think there is a certain tabu that is placed on women who want to "marry rich." Sure, many women who want to marry rich may be money hungry and shallow, but aside from those "typical" women, there are other women who use marrying rich as just one of the factors in finding someone.
I have a friend who is from a wealthy family. She is concerned that men will want to marry her for money, and that's why she wants to marry someone who is rich as well so she know he's not in it for the money. I don't really get it, maybe it's a rich thing