Because I have yet to see anyone have plastic surgery on their face, and look better and younger.
I think the problem is that you can't just have one facelift/filler/whatever, they have to keep doing it to maintain a line-free mush. That's when the problem starts.
Madonna's plastic surgery is so terrible that she looks like she's had a stroke. She can barely close her mouth, has great difficulty moving her top lip and has a wonky eyelid.
And in the interests of balance, Jon Bon Jovi looks like he's had reconstructive surgery after suffering a horrendous incident involving fire and Simon Cowell's face looks like he's having a permanent allergic reaction to something he's just eaten.