We have sold a few bunnies and one thing I can say is that people like to be able to pick their favorite out of the litter. Even in a litter where they were all technically the "same" color (broken blacks) people had clear favorites for various reasons. It would be very difficult, if not impossible, to standarize each rabbit color and pattern down to the point where each rabbit within that group was nearly identical. That uniformity helps hatcheries sell chicks because people know exactly what they will be getting when they order their favorite breed and variety. So if someone wanted a broken black mini rex, what would they get from you? Would it be mostly black? Mostly white? 50/50 black and white? I think if you want to start your own rabbitry you should pick a breed or two that are in demand and interest you, try to sell some bunnies locally through Craigslist or your local classifieds, and see where it goes from there.