This brings up an interesting point. This does in fact happen almost everywhere. Defaults occur for off peak weeks far more than peak weeks. Who pays for these defaults and associated bad debt? The remaining owners which now results in a ratio change that weights the red week owners more because more of them remain versus blue week owners. This causes the red week owners to subsidize the blue weeks, and not the other way around.
If you were to put each season in it's own bubble on actual expense, the blue season would pay a much higher maintenance fee than the red season. There aren't nearly as many current paying blue season owners as the red season. With fewer weeks to allocate the costs to, maintenance fees would have to be higher.
If you changed the model to have blue weeks pay a lower maintenance fee (and therefore the red season subsidizing the difference), it may result in less defaults but how much less is debatable. It would also obviously cause the up front price of red to go down and blue to go up. I don't see much gained, if any, by changing the current model. It would definitely devalue peak weeks.