As I say, some places do have valid reasons for PPR (and your gliding site is a great example); what I'm trying to make a point about is places that seem to insist upon it for no good reason.
For example, my PPR briefing for Fairoaks consisted of "Don't fly into the crane thats miles away from the airport, and don't fly into the Heathrow zone". Gosh, thanks, if I hadn't had that briefing I'd have considered busting Heathrow after bouncing off the crane to be plan A...