I honestly think that you excagurate a bit but then again you're entitled to your own oppinion.How can you even call it pathetic? It's just a snake that happens to have certain genes that makes it look the way it does. It sure isn't unworthy of life and if people don't want it - then why keep looking at it? It doesn't make any sense to look at a thing that gets you in a bad mood. And also would this mean that Stephen Hawking is pathetic despite his great contributions to science?
If the breeder wants to create some more of these Derma Balls then just let the breeder mind his/hers own business. Who knows maybe he/she might be sincerely interested in creating some more of these ball pythons. Most people will probably not be interested in them just like the case with hybrids. I wouldn't buy them. But I will say this: if the Derma Ball works fine in captivity and dosen't suffer (which we can't tell) then I honestly don't see any problems of it being bred.
The snake might be inferior to a normal functioning ball python but I pressume it still can use its tongue to smell where the prey is. And despite the ''little below'' normal eyesight vision in terrestial snakes then it still can see a prey within some distance. And while we're at it then I also pressume it can sense the vibrations coming from the ground. So it might lack a good tool for hunting (''heat sense'') but it isn't all vounable compared to other animals that are bred without people lifting their fingers. I'm thinking about some defenseless lizards, snakes and amphibians.
It just the same thing with albinos and pieds. The colors would probably catch ones attention if the snake were spotted by a mere glimpse. I'm pretty sure that they're more easy to spot in Africa than a normal or darkly colored ball python. Based on this then I pressume that an albino, pied and some other color- and pattern mutations is more liable to be attacked by a predator. This sounds like a big disadvantage and yet we see several types of albinos, pieds and combos being bred every year without people lifting their fingers.
If we even go beyond reptiles then we could take a mexican hairless dog. They're being sold with pedigrees and some people seem to like them. And results from tests show that they're not more liable to infections and so forth.
My point if the snake works fine and doesn't seem to suffer then I don't see any problems if it being bred on a normal basis. But I do think that the breeder should make the buyers aware of any potential things that might influence the buyers oppinion.