I see nothing really wrong with body-modding, even the more "extreme" ones(like the ones shown in the first post). Everyone has the right to do what they wish with their bodies and all that jazz. Honestly, you like what you like, and it should really just end there. I'm planning to get an implant and some tats, but it will be on places I can cover up.
I do on the other hand understand the views of the people who do not approve or appreciate this. As stated earlier in this post, you like what you like, right?
For me, it's more about the person than the modifications. See, I've met a couple of people who have extreme body-mods, and most of them have been kind and generally nice. Some, on the other hand, have not been so kind. I once got into a fight with some dude who had Nordic tats on his face because I was looking at them, and that's not really cool.