Rick,
My primary example is Rock Creek. And, my information may be a little dated. They have done some building since I looked into it.
Rock Creek sure isn't worth even $150/month. Most Portland area clubs are a lot more spendy than that. I had two friends that were members there in the 1990's, and they really didn't like it - the course was always very wet, houses are everywhere, and the course design is uninspired. In the spirit of fairness, this was 15 years ago - much may have changed.
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Let me give you the singular reason that brought me to join my first club, Riverside (OR - H. Chandler Egan) in Portland.
I'm playing at Heron Lakes about 2pm on a Sunday afternoon. Not terribly crowded. (Before I go further, let me add that I enjoy the original course at Heron Lakes - an excellent muni designed by RTJ, Jr.)
I'm a single, and I was paired with a nice guy that turned out to be a dentist. Good player too - we decided to play off the back tees and hit good tee shots.
We're 20 yards down the fairway when the starter asks to wait - he has a twosome he needs to pair up. No problem - right?
We introduced ourselves, and discovered that it was the first time these guys had played in 3 years. They proceed to try to play from the back tees at which point the dentist suggests that they might want to play one of the other sets of tees.
Bad idea. The guy throws down his bag, starts cursing at the dentist, and goes to get the starter to complain. Well, we'd seen enough - we hit the road, walking very fast down that first fairway.
We saw them later on an adjacent fairway with no shirts on, hitting their shots merrily 50-100 yards while golfers queued up behind them.
I owe a lot to those guys, for they're the ones that introduced me to the joys of private golf.