I'm emotionally against hybrids, but can't think of any rational reason to be against them--they are all pets, and they're never going to be in the wild, so can't contaminate the gene pools of wild populations. I don't see that a burm-ball is really significantly more Frankenstein's monster-ish than a Calico piebald cinnamon whatever ball python.
Nature doesn't adore the purity of species the way we seem to--natural hybridizing occurs along the boundaries of similar species, and it is part of the engine of evolution, not an 'abomination'. (As polar bears are forced inland by shrinking pack ice, 'Grolers' are spotted--polar/grizzly hybrids). Granted, a retic and ball would never meet in the wild...but...these animals are not in the wild, are they?
I have absolutely nothing against glofish, or neon mice, so why be fussed over a Burm-ball?