Good Sam Network, thanks for the reply.
The first visit was for 3 nights so no weekly or longer discount would apply. In the second, method of payment did matter.
I called Good Sam after my post, should have done that first, and their answer was they don't really have control over campgrounds not under their ownership so they can do what they want. I suggested that agreeing to be an "official" park should obligate them to offer the advertised terms. Got nowhere with that. This a different answer I got from you who I assume represents Good Sam In some official capacity.
I am sorry I ever started this. Between the two discounts received and the $25 coupon for first night camping the first year membership is covered. I may just let it go at that. We did this on a trial basis and have 11 months to go. Hopefully results will get better.
Lots of Good Sam members here so experience must vary.