Why do people rate mixed color eggs as less valuable?

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Why do people rate mixed color eggs as less valuable?
if you want them pm mei would take these eggswouldn't mind putting them in my mixed flock
if you have any eggs at any point please pm me i would like some more d'uccle colors ill take project also im planning on working with mahogany myself and would like to develope pied d'uccles i love pied thingsIf you put a Mottled Roo over a Mille or a Blue Mottled you can get any combination . My Black Mottled over Mille, the first hatch I got Blue and Black Mottled, Mille's and Blue Mille's. after that hatch nothing but black and blue mottled have been hatching. I sold those cheaper because you don't know what you are getting, and raised the price since I penned up by variety. Does that help.