I've seen a lot of shows on this disorder, and I'm really torn between thinking this is just an extreme version of BDD (body dysmorphic disorder) and therefore those with the disorder should be treated with psychotherapy; and that even if it is BDD, maybe it's best for the people to get what they want. Of course, the same argument could easily be made for transsexualism, and if so, perhaps if the individual is so convinced that he/she/whatever needs any surgery possible to feel like him-/her-/what-self, the best course of treatment is probably that which is traditionally proscribed for transsexuals (therapy, then surgery).
In the end, I figure people have a right to do what they choose with their bodies; my philosophy is that if I'm not hurting myself or someone else, what I'm doing is likely fine. If people such as those with BIID seek healthy ways to satisfy their dysphoria, such as surgery, perhaps it would be best to cater to their needs medically before they take matters into their own hands (which most do, from what I know on the subject).