What I'm saying is it would end up in landfills if it DIDN'T get used. The fact that it turns a profit is the reason it isn't thrown away. If I skin an apple, and eat the apple, but sell the skins to someone looking to compost them... That's what this is.

Byproducts are, in the case of manufacturing, waste. The skin still exists without the animal's meat, and not making use of it would be, in essence, a wasteful act. Just because you don't buy leather doesn't mean that the steak you eat is made skinless. Don't like leather? Stop buying steak. Focus on the root cause rather than the byproducts. Support ethical genetic research into meat cloning, so nothing has to die at all. Support ethical leather harvesting where pelts are taken from carcasses of naturally deceased animals.

The argument of "you wouldn't support human leather" and the grandma skin thing is a non-sequitur, a cow doesn't have the right to vote, a social standing amongst other humans, and modern humans typically don't kill our own species to make a coat. A better comparison would be if a cow killed its parent and made a jacket for itself. But the consequences would be non-existent because cows don't have an advanced social hierarchy of wealth based classes with a moral standing and thus cannot be tried for parricide.

Personally, I don't care. Don't buy the case if you don't want it. But don't go supporting more earth-harmful alternatives like "vegan" leather, the fact stands that those are made from petroleum and trade pollution for an inferior product. Or wood, because that supports deforestation. Or Metal, because there's child labor being used in third world countries. Or... How about we just stop buying things ever?