Hmm,,,, I've seen enlarged guppies, male and female. They looked like BALLOON MOLLIES, and their spines ended up distorted - it's more common in guppies coming from or in a bad water quality tank. Where I got my pleco, all her guppies - even the babies - were huge bellied like that, because of the harsh environment.
Breed for the breed, not for the money; the words any REAL breeder would understand.
You must know nothing in order to know all, for all is nothing and nothing is for all.