Stolen from Facebook

You're assuming name recognition is what they seek. The thrill of fucking a famous person (and one who is conventionally attractive, to boot), and the extravagant lifestyle that naturally comes with dating a wealthy person, are much more obvious 'goals' here, no?

There is clearly a power differential

That doesn't mean anything by itself. There is zero indication these women are entering these relationships against their will.

he is using them

No more than they are using him, if any 'using' is going on at all (which you are merely assuming).