Guess it depends on the kinds of places you pick to stay... we've stayed in an excellent Passport America park in high demand prime location, peak season, loved it and returned twice for longer stays. Sites almost all full and place adds more amenities each year. One night's stay pays for renewing the annual dues. And they do ask to see your current PA card, by the way.
No personal knowledge of "Great RV Escapes."
My edit: I posted this response in answer to different person just before me who trashed all Passport America campgrounds as dumps that never even looked at your card (nothing to do with "Great RV Escapes.") But his post has mysteriously disappeared, apparently edited out yesterday by the MOD.