It's because of racism that interacial sells as well as it does.
 

I might be wrong but it seems to me that the entire "black man on white woman" genre does well because of it being taboo... And that's a direct result of racist attitudes.

What I don't get is why smut peddlers care about social problems when all they should be doing is trying to make money.

they care for reasons they will disclose at a later date.