We all have to keep in mind that there are potentially unthinkable scenarios where a dealership may need this tool. As a franchised dealership every dealer should be prepared to tackle the "worst" case scenario. $5,100 is an opportunity cost that the dealership should invest in. Ultimately EV's are the future. Plus $5,100 is a whole lot better than $50,000.
Subaru made it mandatory to have a road-force wheel/tire balancer by 2013 for all their dealerships. They were extremely specific in saying that if you did not have one, they would send you one and credit the dealership. It's a cost of doing business. Reality is, if there was ever an issue and only 1 regional traveling mechanic, the negative publicity from people having to wait a ridiculous amount of time to get their car fixed would simply kill everyone's reputation. That's the automotive business for you. "Damned if you do, absolutely damned if you don't."