Truth is black men
don't sell so well in gay porn. If they do it's usually mainly because they're sectioned off where a white audience can conveniently fetishize them if they so choose. And I say that with all the honesty I have in me.
Yeah guys will say they don't care about race, but horny eyes will usually flock towards white models over black...or Asian, or often times Latinos and everything in between.
Your question of whether guys would rather see an ok/average looking white dude vs. a very attractive black dude in porn is answered every day on most gay porn sites. Have a look at the front page of JUB and Waybig Blog and most others.
But for what it's worth, I'm rooting for you man. I think. I mean if you really wanna get into this business I am. It'd especially be refreshing to see a non-thug black model out there.