Eh...I'd want a lot more effort spent to ensure patients are given 100% accurate, fully informed information re: outcomes and upkeep, and give consent only after seriously weighing that, but I dunno about banning purely cosmetic surgery.
A) I like the idea that humans have the freedom to modify their own bodies in whatever ways they see fit, so long as they accept the risks and realistic outcomes, and B) Banning would just create more underground practices, which is particularly bad for patient safety.