The driver grosses that much, but has to cover gas and the cost of the car itself out of their share. The actual amount the driver keeps appears to be on the order of $10 an hour, so I doubt we'll see very cheap rides any time soon.
I imagine those details work out to be cheaper per vehicle for a company with a large fleet of nearly identical vehicles and a dedicated operations team.
Google can price a similar trip at $7, saving the rider $3 and boosting the revenue by $2 to $4.50.