Riders are only one of Uber's customers -- drivers are the other, and if they clock in during surge pricing and never get a ride, they'll stop clocking in - why

Riders are only one of Uber's customers -- drivers are the other, and if they clock in during surge pricing and never get a ride, they'll stop clocking in - why bother getting in your car and driving across town to find out that even though surge pricing is in effect, you can't find a rider?