Costs of a gated community run from 100 to 350 US dollars a month on the North Coast from what I have seen. The services you get vary but can include security, street lights, garbage pickup, cable tv, back up electric, Tennis courts, stables, landscaping of common areas and streets and more.
I would consider living in a gated community whether I was here part time or full time because they are generally decent neighborhoods in which to live with like minded people. Some neighborhoods are better than others and I would look into that before I purchased both on these message boards and in person.