Yeah, I've seen similar prices in one store. Oddly, I think one of the highest priced corns that store had was an amel. Yup. Plain old amelanistic. You know, the morph that's been around since the '60's or so?
I actually can see the uneducated public being willing to pay more for an amel. They are very colorful and attractive. And since most pet stores care much more about making money than anything else...