I can totally understand someone having a color preference. HOWEVER I can also understand a breeder not wanting to mess with someone that MUST have a certain color.
For instance, someone wants a SUPER DUPER black sable male pup with a certain temperment. The breeder might "get lucky" and have one in the first litter of the buyers choice. OR it might take several litters for the "right puppy in the correct colored wrapper" to come along. I know of folks that have waited thru several litters for the "right puppy in the right color" and had NO ISSUES with waiting a year of more if necessary, but it seems to ME that it would get to be a pain in the rear for the breeder after a while.
I will admit that I too wanted a VERY dark black sable pup. BUT I also told the breeder that in the grand scheme of things, it wasn't the end of the world if I got a lighter sable or even a solid black pup as long as the pups temperment matched what I wanted and NEEDED. As it turns out, Siren was the LIGHTEST one in the litter. I had me choice between her and 2 of the other females in the litter and they were BOTH darker than she was, but she is the one that sounded and acted most like what I wanted as far as temperment goes. (Though the other 2 were fairly close.)