>>> All the aggregated minutes of driving it has saved me over the last couple years would not have been worth it if yesterday's single poor routing decision had ended with me in the hospital/dead and/or my car totaled.

I don;t think you need even go that far. All those extra corners, braking and such aren't great for the car. They have a cost in terms of maintenance. Lots of "city miles" driving is why cop and taxi cars fall apart so quickly. I doubt so many people would follow Waze so closely if they new it was going to cost them a couple hundred extra every year in parts.