Yeah, whenever a customer requests black cloth on their table, I remind them they'll have to use black chalk which results in black hands when you play, black shafts on your pool cues, etc. Not to mention the balls just won't show up well on any dark color cloth, unless you have an amazing LED light fixture.
Sometimes the customer will then change their mind, and sometimes they won't - particularly if you're dealing with an interior decorator who is choosing the color, in which case all they care about is how the cloth color matches to everything else in the room.