Tips ensure good service in service industry jobs. Its that simple. For the record tho I always tip uber when I ride. I feel sorry for you all. Uber feels that stars ensure good service lol. Ill stick to just getting handed cash any day. BTW I drive a taxi and not only do my fares pay 3x more 90% tip and about 10% tip 20+. Id never stiff an uber driver you guys work for tips.