Not a huge amount. For about 300 million users (just in China) that's about $6.66, or about 40 Yuan, or about 4 minimum fares (paid fare) per user depending on

Not a huge amount. For about 300 million users (just in China) that's about $6.66, or about 40 Yuan, or about 4 minimum fares (paid fare) per user depending on city/type of car. I've received far more than that in promotions (where the promotional difference from regular and promotional fare isn't deducted from the driver).