I have never been involved with Uber and am not familiar with how much the drivers make. I think the original concept was based on "Someone needs a drive and I'm heading that way anyhow...might as well make a buck." If this is the case it was not really meant to provide someone a real income.
After dealing with gas, maintenance and depreciation (as those kms rack up), the increased cost of insurance (because, yeah, all the drivers are carrying extra insurance) are the drivers really making that much money? What is their % take of the Uber charge?