Have a look at post #117 on the Tesla costs. Not all Superchargers are open, but many are - including Harrogate. Why does not everyone take advantage - lots of reasons; education - people don't know; convenience - there is no charger where you want it; subscription cost - you need at least 2 if not 3 decent charges in a month to make the subscription worth while. For me - I rapid charge a handful of times a year. For that little, it's not worth paying the subscription premium, and I save so much on all the times I am not rapid charging, it's not worth fussing about. I pick a charger that is convenient and available (Tesla dont yet have an open API for their availability, so unless I have a co-pilot with the Tesla app, I cant see while I am driving).