"An elementary school custodian could afford a mortgage, a car, support a family of 4 and go on vacation on just that single income. " Can I ask what you are basing this off of? I'm fairly skeptical of this claim.
The elementary school where my kids went (in a much more wealthy district) doesn't even have a custodian that I'm aware of, just a 3rd-party cleaning service that hires immigrants for as cheap as possible, and I'm sure doesn't offer healthcare or even full-time work. They have too many highly-paid administrators to afford a custodian.