It would be interesting to know more about the "behind the scenes" back and forth between the resort and Tesla as this was conceived, constructed and built. Initially Tesla owners were encouraged to come to the resort it appears -- since a stairway was constructed for just that purpose. The resort likely then realized that they had opened their exclusive doors to dozens of quick visitors a day who likely were not spending money and were impacting their own guests' experience... someone paying $4,300 a night (just checked October rates... WOW) is not going to want to mingle with patrons of what amounts to a gas station, even if it's traditionally been a high-end station. If the resort wanted chargers just for their guests they could have just installed destination chargers, as we all know. They may have envisioned this when Teslas were $100k+ and attracted a more exclusive / wealthy crowd.
Having said all of that, it would be a nice gesture and make security's job much easier if they would just construct a small bathroom for the use of chargers as well as employees, who I also think may park down there. Presumably Ventana's motivation in installing a supercharger was to foster goodwill among the driving public, but in this case I would guess more damage than good is being done given their policies.