Why horses who have a Champagne colour, are they most appreciated and more expensive, are they rarest ?

My horse is a champagne palomino. I don't think they are rare such as less sought after. For example people usually breed for bays or greys. His dam way a dun and his sire was a bay, so there wasn't really an intention to produce a champagne palomino. If anything in the hunter world I think his colour would lessen his value because it's so uncommon. For breeding purposes they may be expensive if people want to produce more of them. I feel like non - horse people would appreciate them more for their "cool, unique" colour than horse people.
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