That depends who you ask. Blood parrots are disgusting, mutated examples of mankind's horrific ego. They should never have been created, and they should not still be in creation. Horrible, horrible creatures.
If they're sold as hybrids, that's one thing. But, 99% of them are not. And, even if YOU sell them as hybrids, what's to say that the person you sold them to will not then turn around at some point and sell them as some pure species to someone who doesn't know better?
You walk into most pet stores, and 90% of their African selection are hybrids. 90% of those people buying them, are not educated enough to know they're not a pure species. They buy the fish, they then breed, and that person sells the babies as pure whatever, to someone else who doesn't know better.
Or, you get someone who buys a "pure" yellow lab, and then finds out that it's actually a hybrid. Personally, if I buy something as a pure fish, I damn well expect it to be exactly what it was sold as, so finding out it's a hybrid afterwords would piss me right off.
There is absolutely no need for hybrids. None. Especially within the cichlid family - there are literally HUNDREDS of pure, naturally-occurring species that are absolutely STUNNING. Why on earth do we need to create some dumb hybrid when there are so many natural and pure species to choose from?
It's simply irresponsible fish keeping, in my opinion.