Ride sharing services like Uber and Lyft have recieved over $25 billion in investments, far more than, for instance, social media sites. This article gives 10 reason why ridesharing is so popular with investors. Reason number ten is the most convincing: “each transaction generates 10-15% cash flow to the tech startup. Unlike struggling social media startups who are still searching for their revenue models, this market generates direct revenues for every transaction –- with low costs.”