I had a black car.... once. That was enough. I'm way too anal to wash a car daily; that's about what needs to be done when you own a black vehicle, at least in my world. That, or seal it in a plastic bag when you're done cleaning it and not drive it.
I lost my mind seeing dust visible on the finish in under an hour after doing a complete detail and polish job.
Having ranted, I do agree that there's not much cooler looking than a freshly detailed black vehicle, I just can't justify spending the $$ on medication putting up with the upkeep.