If a breeder screws up and ships a normal to someone who paid for something else, that breeder needs to make good and refund the difference.
As for selling something more as a normal, that's a bonus for the buyer. I have some eggs incubating that could produce specter. If I'm not sure, I'm going to call it a normal. I'd rather get less money now, than to rip off someone by selling an animal as something more expensive.