That's a ridiculous argumentation. This infrastructure was not built or maintained "just do idenfiy those 10 people in a neigbourhood that have "saved" 300 bucks a year". It exists for lots of different, likely more useful use cases, and this is just another added usecase that can utilise already existing infrastructure for no added cost.
Your statement is comparable to calling it ridiculous that we have roads "just so an ice cream truck can sell ice cones to neighbourhood kids during the summer". That's obviously not the main use case for roads.
Your statement is comparable to calling it ridiculous that we have roads "just so an ice cream truck can sell ice cones to neighbourhood kids during the summer". That's obviously not the main use case for roads.