At the risk of starting a long debate on this topic, we felt the same and after doing the math, we became members so each time we visit it's a 25% discount. Because we knew that we'd be going 2 or 3 times per year it will be a good deal for us. Our membership is paid off and we have hit that breakeven point so now it's a true discount each time we book....really helps during our spring visits (March) when rates are high season.
IMHO, it was a no-brainer, we have heard many reasons people would never do it and we respect their perspective, however Desire has become our destination when on holiday and we don't see that changing anytime soon. So, we rewarded ourselves, knowing that the resort doesn't have a reward program!