On one hand, 4chan is filled to the brim with jokes about black guys fucking white girls. You can't post a woman's picture (civilian, pornstar or even anime) without some joker saying some variation of "built for black cocks", so whatever they have to say about black people having sex must be taking with a whole pinch of salt.
On the other hand, I can actually believe it. Male porn stars don't exactly make much. Hell, I remember some top guys like James Deen complaining they had to record like five scenes in a day in order to break even. This being James Deen, he said like it was the best thing ever, but it's clear it ain't easy to spend most of your waking hours in a constant state of arousal and having to cum buckets on demand. And that's only on the male side. Even making far more than the men, the women must also suffer buttloads, literally as well.
Going off on a slight tangent here, this reminds me of a report that a local broadcaster did on the national porn industry. They interviewed a guy who was a regular for Mike in Brazil (and other Reality Kings stuff) who seemed quite broken over how he turned out to be. He thought he'd have a nice living shagging women, except the money was never particularly good and after fifteen years or so in the business, he was at 40 years old, with no family and having to support himself as a taxi cab., yet still accepting occasional porn gigs. The entire report was eye-opening on the nature of the business, at least to me.