Just "backing" you up.

"Anywho, there are a few different genes that cause rexing/curling. Not just one. And I am sure there are more than 2 hairless genes to differing degrees of hairlessness."

True, however, only one true hairless gene has been commonly available to the public. Rex is also the most common curling gene available to the public. Velveteens are still uncommon enough to escape most pet stores (at least from what I've heard). Although the harley gene was found in a petstore, it (as well as others) are still somewhat uncommon and not common in petstores or commonly made available to people who plan to breed for feeders.