Remember that there are capacity issues as well. I pulled into the Hawthorne Supercharger 1.5 years ago when there were many fewer Model S's around and 6 stalls at Hawthorne. I filled the last stall. In talking to the other folks there, the closest that any of them came to being local was someone with an office a few miles away that had to do a road trip with little notice and stopped by for a quick top up (that was not abuse in my book).
That was a normal week day afternoon, 1.5 years ago. Not only do I not mind Tesla putting in the extra Superchargers to handle capacity, I applaud it. If there are a few local folks who abuse the Superchargers (for some reason, it seems to be worst with Orange County retirees who think there time is worth less than $10/hr), then Tesla will handle it.
If 15-20% of North American Superchargers go to California, it is good for all of us. Avoiding queues at Superchargers will help Tesla succeed with good PR, and Tesla's success is good for all of us that want to keep using our current and future Teslas!
Besides, 80-85% to the rest of the country is not too bad...
I used Hawthorne a fair bit about the same time, and often found 2-3 local limo drivers using up to half the supercharger stalls.