Surprised no BG experts have commented so far, hope someone 'Big Cedar knowledgeable' responds.
Be careful buying BG resale, owners face restrictions compared to retail owners. My understanding is you would want a Big Cedar BG contract if that's where you intend you use your points frequently. FWIW BG seems to be a relatively expensive system for what you get.
We stayed at the Wilderness Club at Big Cedar 10 years ago in a 2br lodge unit and thought it was excellent at that time. But I see a number of recent Tripadvisor reviews claiming it's not as good now. Still some great reviews, a number of negative reviews about sales, and then the concerning group of reviews mentioned. You would miss that perceived decline based on the less frequent TUG reviews.