I wouldn't say they are valuable in terms of money, but they are rare in comparison to MALE orange cats. Cat's colors can be sex linked. When you see a calico (black, orange white) or tortoiseshell cat (black and orange), they are almost always female.
I'm not sure if you are familiar with genetics. A cat's fur colors are on the X chromosome. A female has two X chromosomes, so she can be black on one, orange on the other, and show up as calico.
She would have to have to have orange on both chromosomes to be an orange cat. Males have only one X chromosome. What ever colored genes are on it, that's the color of the cat.
Proportionately, there would be more orange males than females, because males cannot be calicos (there are a few, but they are mutants) There are a lot of of other factors that determine shades of color and pattern of a cat's coat. If you are still interested in cat genetics, there is a book called "Cats are not Peas" that goes into cat genetics in more detail. Overall- ... more.
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