I am vain enough to understand why people dye their hair or wear makeup, but not nearly vain enough to understand why they would want to look like the Rich Housewives plastic surgery people, who end up looking more like plastic surgery than people.
The sad truth is that they are actually pushed by society to want it. Of course not to want to "end up looking more like plastic surgery than people", but to want to "try anything" to solve their problem, which is a pure societal construction.