It is also unbelievable if you try to do the bottom up revenue numbers. Uber claims to have 11,000 drivers in SF [1], but most of them are part time. This implies a monthly revenue per driver of ~$3800 at the $500 million revenue number. Actual data from surveying SF Uber drivers working more than 41 hours a week showed they only generated revenue of $2971 a month [2]. The drivers working part time (20 − 25 hours a week) only generated revenue of $1376 a month. I can’t think of a way of making the top down and bottom up numbers agree.
Edit. I fixed the broken link [1].
1. http://archives.sfexaminer.com/sanfrancisco/uber-releases-dr...
2. http://www.sfgate.com/business/article/Lyft-Uber-drivers-tur...