Niagara Region PCA member here. Benefits? Well, you get to hang out with other Porsche people, although there are few Boxster owners in my region. I was honestly expecting a snobby-rich-guy club but it wasn't like that at all. Most are owners of 70's and 80s 911s, a few 356 owners, and a bunch of front-engined guys too, and one or two die-hard 914 enthusiasts.
The events are really cool, and although you don't have to be a Porsche club member to attend most of them, you will know many more people if you are and you attend meetings. Our PCA chapter organizes cruises, car shows, road trips, driver's education (Watkins Glen 101
) .
Another nice perk for me is that one of the techs from the local Porsche dealer sometimes shows up, and you can get some good information out of him.