Torture. Thats what maintaining black is to me. It doesn't matter how much you baby it when washing/waxing....you will end up with fine scratches and swirl marks that while normally hard or impossible to see on other colors, will be painfully obvious on black except in a very few light situations.
If you don't want to HAVE to constantly clean your car, and obvious scratches/swirls bum you out, don't even think about black. IMO black requires 10 times more work to keep it looking it's best than lighter colors, and will always look much worse even then !