Having seen what has happened to some of the dwarf hamster species (buy a dwarf hamster from a pet shop and unless you know that it came from a show breeder you are GUARENTEED that you are buying a hybrid. They have massive problems, head tilts, diabetes, glaucoma... and a hybrid is nigh impossible to tell from a pure in many cases even if you do know what you are looking at.
The same has happened with pallid and cheesemans gerbils and now every single pallid/cheesemans in the UK and the rest of Europe is a hybrid and our pure captive stock is lost.
Careless breeding of these hybrids has resulted in total destruction of a species (in captivity).
So as I say... as long as the hybrids never look like either of the parents and the breeders and subsequent breeders of these animals are always honest and make it clear that this animal is not pure and shouldnt be used in a line that will then be used to breed more 'pure' stock then fine...