"Celebs are so worried about losing their looks that they pay a fortune trying to keep them." - I think you are right. Celebrities are so worried about losing their looks, but in the end everyone loses their looks. But still, spending those fortunes keeping their looks more, get them more fans, so more money.
"I think celebrities get plastic surgery to stay as young looking as possible for higher chance of employment and fan base." - just like I said. The more young they stay, the more money they can make. I was reading an interview with Robert Deniro (if I'm not mistaking) about the fact he doesn't get a lot of major roles nowadays being so old. So, if celebrities stay younger for more time, they get the chance to play in a lot more movies or get more contracts. But what do you think about persons like
Elsa Patton? When she was young (from the pictures) she used to look god, but now, after spending a fortune on cosmetic surgeries, she doesn't look ok at all. Who is to blame here? The surgeon? The star? Both?
"For example I have a friend who has had a lot of cancer in her face and has had to have quite a lot of face removed. Plastic surgery in her case is a necessity, not only for her own benefit but also for the sake of others who might be upset by her appearance. " - in this case plastic surgery is on the to-do list
But there are plenty of other cases where celebrities spend tons of money (some millions) and they look worse. They would look better with no plastic surgeries.
"I also have a friend who was badly burned as a child. She had some plastic surgery at the time but not a lot." - in this case, again, plastic surgery is necesary.
"I had plastic surgery after a car accident so that probably doesn't count. " - I think there are 2 type of persons that get plastic surgeries. Those than need them for real, yet those that don't. You are a person that needed it for real.
"Does pretty make you dig quicker ?" - No, I don't think so, but, who knows?