These types of things are exactly why I feel the way that I do about them, there are countless examples. They have done absolutely nothing to instill even a bit of trust. I feel for your plight, it's not a fun position to be in.
We will never buy in again at the Desire Suite or Mansion level given our poor experience to date actually being able to use our nights.
Unfortunately the lesson that they need to learn is what you stated, but as long as they are coming out with a net positive (or at least they think they are) they are unlikely to change. I bet if they didn't already have your money and you could choose to cancel things would be different.