Earlier quoted context omitted.
Talk to your drivers about it. So far they've all told me that they get more passengers thanks to the app, and the pay from Uber's base rate outweighs unpredictable tips. [edit] NYC, and the drivers are pretty candid about still picking up rides from black car dispatchers and competitors. I have no reason to question their honesty.
All drivers I’ve talked to (mostly in the London area) told me they are very unhappy with their pay, but because Uber is so cheap, they can’t drive for their old cab companies anymore (all business moved to Uber).
Every time I get in some yellow cab that's a 5 year old Crown Vic with torn seats, rattles everywhere, and a driver that can't (or won't) tell me how much my ride is going to cost, I remember why I normally take Uber.