As far as temperaments, I've seen horrible ones in pet-store hamsters (not mine) as well as some "fancy" pet-store rats: this can happen when large commercial breeders pay no attention to avoid excessive inbreeding, & only breed for appearance. Just like happens with "purebred" dog breeds, inbreeding keeps both the "good" traits (those wanted for appearance) as well as unintended poor temperaments, & not every seller cares enough to avoid this- all they want is to make that immediate sale of a "warm body" regardless.
Silky & satin mice: I can remember similar issues- including the long-haired mice just being "impractical" for sanitation reasons. Not many people keep "show" mice in this country, so I was happy to quit producing them too; they were just a pretty novelty & I much prefer my strong healthy breeders with less "fancy" coats. (All my mice are still "fancy" coat colors, but not fancy textures.)









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