system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Some jobs are unpleasant but fundamental to society (eg: janitor, bus driver). Why aren't these the best paid jobs?
gpt
Because anyone can do them.  They are low skill and lots of people can fill that role.

Sometimes they do get better pay because the job is undesirable (I think trash collectors get paid decent, at least compared to minimum wage).