I think the problem is clearly overbuilding for the market. The Chicago area has seen a whole bunch of so-called CCFADs opened in the last few years -- think of Thunderhawk, The Glen Club, Stonewall Orchard, a couple south of the city, and the new Bolingbrook and Foxford Hills and adding those to the other relatively new CCFADs (Kemper, Ruffled Feathers, Prarie Landing, Cantigny, Pine Meadow to name just a few) means a lot of competition for the high end. Moreover, while these are for the most part good courses, given the time I'd rather drive an extra 90 minutes and play any course in Kohler, which are way better (except maybe the Irish course), if I'm going to go high-end (incidently, why hasn't Kohler received criticism usually reserved for CCFADs? Isn't it a CCFAD? Could it be that it is relatively unpretentious, the golf is great and the people there are terrific to deal with?).
As for joining a club, I would actually consider it if the course were really good and classic - the newer architects work is easy to find - but I wouldn't have the first clue as to how to go about it.