I never did understand why the world switched to black keyboards, it seems like they are much more difficult to label the keys.
Because beige is ugly. *
Seriously though, beige is ugly.
Black's not all great, either, but it does age better than beige (it obviously doesn't yellow), so that might be part of it as well. Some companies, like Costar, do it (make black keyboards) better than others and very well, for that matter, and Cherry has a method of laser-etching black (or any other dark-color) keys. Double-shot molding is equally difficult in any color.
Lowpoly's chocolate and cream 'board, however, is the only keyboard I would murder somebody for.
*There is something to be said for nostalgia, but honestly, beige is ugly.