If all hybrids were infertile, I wouldn't have a problem with it. I once saw a picture of a clutch of F2 Jungle corns. Jungle corns are Cornsnake/Kingsnake hybrids. The F2 generation produced a lot of interesting patterns and colors, but the most memorable hatchling to me was the one that looked exactly like a corn snake. You could not tell by looking at it that it was a hybrid though a significant portion of it's genes came from the kingsnake ancestor. Raising that animal up and breeding it, who knows what you would get? You could throw a big wrench into somebody breeding plans who had a specific goal in mind. Personally I think that people who create hybrids are very short sighted.