Yes, but I'm biased. Just got home from a PCA BoD meeting. My wife and I have made new friends with some really nice people. Gone on some nice group trips/drives. What chapter are you considering?
From a purely financial view, you get a monthly subscription to PCA's Panorama magazine. Dealers will give you a 10% discount on parts and service. Most indy shops will also honor the discounts. (In my case, my membership has paid for itself via parts savings.) You can tap into a network of people who really know these cars and where to take your car for help.
Here is the link to their webpage that goes into more details.
https://www.pca.org/membership-benefits