They really don't. Uber represents itself as profitable for Uber drivers, but this is only true in the short-term. When you factor in car maintenance and depreciation etc, the "profits" that Uber shows you essentially go out the window. It's equivalent to selling a tiny bit of your car's value.

If Uber raised their prices, the average real value would drop from its current real value of $2/hr, to...

Hell if I know, but it could well be negative.