Have you taken a Waymo before? The car and ride in general is much nicer than your average Uber or Lyft ride.
Cost savings are a huge factor, but in self-driving (and other areas) safety and consistency are equally important.
Waymo's make mistakes, but they don't get tired, drunk, distracted, or angry.
I look forward to competition bringing prices down, but on pure quality and willingness to pay, the premium price seems to make sense.
[0] https://waymo.com/research/do-autonomous-vehicles-outperform...