it's true of many doctors as well. the difference is both doctors and bankers do it for a few years at the beginning of their careers, and in exchange are promised a path to a real reward -- they get promoted, and their pay increases in a job where they can work more reasonable hours.
these Amazon warehouse jobs don't lead to being a millionaire. they don't even lead to a decent career. i doubt you could even get promoted to Amazon low-level management out of one of these jobs. it is pure exploitation.