I think it's simply the fact that very few ,even if short ,would seriously consider undergoing this surgery.
Most people can accept there physical shortcomings(no pun intended).No offense to anyone here but only those that are mentally ill and know they can't overcome their neurosis would seriously consider cosmetic surgery (myself included).
Also this surgery is incredibly expensive for a cosmetic surgery, probably the most expensive, so that's a major barrier for many.
I do wish the veterans would stick around more though , they're invaluable.