People often don’t really know why they have the fetishes that they have. Race is a charged issue, but there are folk that fetishise interracial porn on all sides of race. So while it has a racial element, I don’t think that it is any more racist than people who have rape fantasies are misogynist/misandrist.
I think that being paid more for IR scenes is really just a product of supply and demand (free market, yo)! Presumably you held on anal to increase your rate, that doesn’t mean that you’re perpetuating the great divide between the arse and the pussy ;)
Please don’t take the above as an attempt push your boundaries. I think that you are a little harsh on yourself and if more folk were as sensitive to issues surrounding race, the world would be in a far better place.