Lynn -- but how do members know that you offer a 50% discount if you're not in the directory?
Strictly word of mouth at this point.
But for us, this is not about what we do as park owners, but rather the benefit that we, as WBCCI members, receive from our membership. When we first started traveling a bit, we brought the old WBCCI book -- and discovered right away that the parks listed there had no idea what the WBCCI was, much less that they were supposed to be offering a discount. Ah, duh.
Then we started offering a WBCCI discount, a small one at first, and contacted the WBCCI about it. They listed us. Fine, no big deal. What was a big deal was that nobody seemed to follow up in any specific fashion in subsequent years to make sure that we would continue to offer the discount. Ah, so that explains it. Those other parks may have been contacted 20 years ago (or whatever), and they agreed at that point to offer some smidgen or another. Since then, people die, parks sell, who knows what, but the listing continues. No wonder we had such a long list of parks, all presumably offering discounts. And a total rip-off to members.
The 50% story came along when we started offering it, and some of our WBCCI friends noted that Passport America parks offer the same. So we looked into Passport America. The thing is that these parks are included into that system for free, though the parks can (and do) set conditions on the 50% discount (no major holidays, only weekdays, whatever they want).
So why can't the WBCCI set this kind of thing up, too? The participating parks get listed in a directory (I suggested an online one so that it can be updated easily and quickly), and we WBCCI members can take advantage of it in our travels. It would make the $65+local dues immediately worth the money if they had even half of the number of 50% parks that Passport America has.
Note, by the way, that this kind of thing would not be "good" for us as park owners, but rather potentially "bad" for us, because it would presumably give us competition where there is none now. But that view is all screwed up. We do the discount just so that we can see our friends in the WBCCI more often. At best (or worst), we'd just wind up seeing our friends less often.

Lynn
PS: No, we're not in the Passport America system and don't plan to join.