Pits get docked in Michigan a lot because you see a lot of fighters. If you watch something like Animal Cops Detroit on TV , it seems like half the show is breaking up dog fighting rings. I don't know about Kalamazoo, but I've heard its pretty bad. I've seen some with cropped ears too. Most people who own them as pets only have them natural, but I've seen a few not. We were walking my friends 3 pits and were offered 2,000 for the group. They said they would offer more but they wanted cropped and docked. Of course we told them where they could go, those dogs are their babies, but I see it a lot to because it looks more aggressive. It is one trend that seems to be slowing though, as I haven't seen it lately.
Maybe it was just happening in our area, but thats what someone told me they were doing it for.