Uh, if someone were raising hundreds of children in cages and then selling them to anyone with enough $$$ to buy one (which would have a big pedophile market, I'm sure), then THAT would be the same thing.
Naturally people have different opinions on child-rearing, some will be for spanking and some against, etc, but there are still some common sense guidelines that everyone with a brain agrees to, like "Don't lock kids in a cage all day to wallow in their own filth."