This question is kind of interesting, I remember coming out of the academy when I reported to a level twelve center I thought the parking lot would look like a car show. There were some gems but 90% of the lot looked like exactly what you would see at the mall, and I felt like a bit of a ass showing up in a newer BMW I had purchased at my old job before starting ATC.
As others said lots of individual situations, some people know finance and have lots of nice things, some get divorced twice before 35 so they split the high income three ways, some are inexplicably in super high debt despite the income, some use the majority of the money to take care of kids or elderly parents, etc....