I think we have to realize that women who are "black only" are not that big of a percentage. My good female friend (long time friend, nothing sexual), had a black boyfriend, she went black, and did go back to white guys, she is in a long term relationship with an eastern European guy. Her comment was that the big cock hurt, and was not enjoyable for her.
There are women who would never sleep with a black man. Women who like to dabble in this for sexual pleasure. Women who keep a white male as a sub. Women who have no use for white men. Just remember that what we see here is not mainstream.