What if every place where they live is paying them around the same rate? Should every person be expected to move and uproot their life to find a job that pays them enough to live on?
I learned at a previous job that one of the biggest challenges in janitorial-services is the insane rate of turnover and difficulty in guaranteeing that a particular floor of a building has been serviced on a particular night...
There is a near unlimited supply of mop-pushers in the world.