We've had our HPWC listed on PlugShare for almost three years, and while I'm sure the many people that have stopped to charge there appreciate it, I'm also pretty sure that they would rather be doing any number of things rather than sitting in our driveway for a couple of hours
And, as HollywoodNY mentioned, the Hamptons summer visitors are definitely part of Tesla's target audience, which is why they host/sponsor many events in the Hamptons...So, while a Supercharger out here will certainly be useful, I think it's just as much of a marketing/promotional opportunity from them as well (and, I've had the Tesla guys charge at my HPWC more than a couple if times) Is it essential? Is it a top priority? Probably not. Which is probably why they waited almost four years to install one out here.