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Uber operates with a loss. The prices are under marginal cost. The drivers have no scale benefits like ordinary Taxi companies when it comes to buying cars or maintenance.

It only makes economical sense to drive for Uber with the car if you can't sell it for a good price (you know the car is good and not abused, the buyer doesn't) and that you don't plan on buying a new car after the wheels fall off on the present one, or you need to liquidize your assets a little bit, i.e. getting approx. 100USD for decreasing the value of the car and buying gas driving for Uber for 100USD.