I have been an Adventure Cycling Assn member for several years but haven't ridden any of their tours yet. They have an excellent magazine and website with articles, maps and other information about bike touring, so the membership is worth it for me. I would like to ride one of their tours some day, but I haven't been able to talk my wife into riding one. I also have several friends and a brother who like to plan bike trips, and we can do our own tours for a lot less money. However, I don't think their prices are unreasonable if you are riding in an unfamiliar location and would like the support and companionship of a group tour.
BTW, one of the forum members recently posted a message in the Touring subforum that tells how you can get a free trial membership in ACA. That is how I first became a member and I have renewed every year since I first joined. Here's a link:
http://www.bikeforums.net/touring/10...-giveaway.html