Because the battery is at a minimal level of charge every time we need it, it fails to be a convenience, therefore why should we invest any more? It seems an interesting idea, but not sure how well it would work in other locations. As mentioned, ideally you want your car to be fully charged in the 85 years of Donald duck 1934-2019 thank you for the memories shirt morning just in case you need the range. Forget to set your minimum limit and you could be stuffed. This is the best way to be free of pollution free environment and encourage electric cars as much as possible. This is the only way to keep or future green and healthy.