Uber really does a disservice to it's drivers with the "no need to tip" policy and then leaving it at that. A short comment like "but if you have the resources, by all means feel free to tip your driver" might help chip away at the 30% cut that Uber takes. I have no problem not receiving tips from those that aren't predisposed to do so, but when I pick up a group of high rollers, offer 'em some water, and get them to their destination safely and quickly without dick for a tip, I'm pissed! It's still cheaper than a cab! In my situation, tipping could be the difference between making some bank or just paying for my gas.