Here is the truth on St. Charles Duck Clubs. There are a few clubs that hold a lot of ducks, and several duck clubs in between all of them, that on the right day can kill a bunch. There is alot of pressure in the bottoms all season long. There are a few very expensive places that offer memberships, and some of them dont even do that. Some are owned by local businessmen, and used for entertaining and such. There are several places that are $2,000 to $4,000 that have a house or a trailer on them. One thing is for certian, on the flight days, most clubs are as crowded as the public places.
There are some real Characters down in the bottoms that own and operate the clubs, and a few hundred "people that know everything about duck hunting". There is a bit of a rivalry between them all as it relates to rumor mills. I don't buy much into them. I have hunted the "finest" and the "most crowded" places in the bottoms, and killed limits at both on some days, and not fired a shot on other days. More expensive generally means less members per acre etc. and maybe a nice place to hang your boots and have a beer.
My advice is if you join one, take it for what it is worth. You are paying for a convenient place to get out and hunt. I would check to see if doves, ducks and geese are included, because some do not offer all of them, or charge for them separately. 2008 and 2009 kill numbers were a bit odd because of flooding and weather. I would look at the past 5-7 years of kill. Go by number of birds harvested / number of members and try and get a birds per hunter / per day average and you will see if you get a good value. Almost all keep kill sheets.
I can get a list of names and numbers for you if you send me an email. I went through this same exercise several years ago.