Bubba's back. 8)
The cost of euthansia has nothing to do with it. You can humanely euthanize a horse for the cost of a bullet. What's that, like 5 cents? It's carcass disposal that's expensive and also incredibly difficult to do. As I believe I said before, it's illegal to bury the body, impractical or illegal to compost it, usually not safe to feed to dogs or zoo animals, incredibly expensive to cremate it, and not all places have rendering plants or garbage dumps that will take animals bodies--if they do, this service is also very expensive. So for the owner who doesn't give a rip about his horse, he can't take it to slaughter, and he can't/won't afford carcass disposal, but if he feeds it just enough to keep it alive he can avoid all these pesky problems.