Sounds here like there is a general animosity towards black superheroes. Not because they don't sell well, but because you simply don't like them.
One character that I suppose could use black protagonist would be the Punisher. Frank Castle's origin is based on the premise that he was a soldier in Nam and served 5 years. By all accounts, he would be in his 50s. My uncle served in Nam and takes great care of himself, but the wrinkles and thinning hair are there. It's a sign of comics' inability to adhere to continuity or realism (duh).
But, while I like Frank, and I love what Ennis has done with him, you have a person on a holy war. Anyone can have a holy war against crime. I think.
But have a guy in a ghetto doing some nice police work or something. His whole family get firebombed by some politician with gangster ties. The police don't do anything, and the neighborhood cries for social injustice. So, this guy has a vendetta against everyone who is corrupt. I would buy that.
