Yeah, it (like many things) is a U-curve. The upper class has enough stimulation in their lives, enough social support, and enough self-control that they can experiment with drugs and be fine. The middle class, on the other hand, recognizes that drug addiction is a serious threat, and rigidly avoids drugs (creating a cultural conflict between the two classes over legalization - a lot of social issues are like that). The lower class, of course, has neither the support to use responsibly nor the self-control not to use, and has accordingly been eaten alive by drug addiction.

Rich guys definitely want wives who won't create problems, but they also want to conserve social/biological capital. It helps that sincere feminism doesn't really exist at the top.