As said, the thousand or so campground discounts (15% with a few 50%) alone is probably not worth the dues cost, but the overall package is more than worth it. Beyond the discount parks, there's also the club owned parks and member owned co-op parks, both with very reasonable rates, plus the excellent magazine and the other available services such as mail forwarding and roadside service also at reasonable rates. And the topper is the Escapees non-profit CARE (Continuing Assistance for Retired Escapees) center that offers specialized facilities near Livingston, TX to assist fulltimers with illness or injury recovery either short term or long term as needed. No other RV club offers anything like it that I'm aware of.
Escapees C.A.R.E.