Oh god, it's like watching a cat play with a mouse...
Anyway, back to the OP - no, personally, I wouldn't have cosmetic surgery. Just because the surgery is for cosmetic reasons, doesn't make it any less serious or the inherent risks any less. I'm not going to leave my kid without a mother purely for vanity. Would I have done it at 18 if I'd had the funds? Probably.
That being said, who knows how I'd feel if I ever needed reconstructive surgery - fortunately I've never been in that position.
The idea of doing it to 'appeal' to someone else... yeah, the money would be better spent on counselling IMO.