I have no idea how they arrive at that number. I think I read somewhere that its a hypothetical rate, assuming someone worked a given number of hours.
Or else the "Data Driven" company doesn't know what the difference between Median and Maximum are?
On another note, I've met quite a few UberX drivers who have financed their cars. That level of fixed costs make someone significantly less able to absorb any price cuts.
Finally, what is the really Price Elasticity of Demand here? Even when the fares are at surge levels of 2x, how does often does that deter people? Sure, if its 8 blocks, I might walk it, but at a certain threshold (which I assume is the best revenue anyway) the only other alternative is some other mode of service with an almost equally high cost. My guess is that their claim that lower fares = greater ridership has a much lower coefficient than they let on.