I guess a little of both. For me, it comes down to a question of "killing the goose that laid the golden eggs".

While it is nice that people make these great deals available, there must (and has) come a point where the aggregate financial...penalties...become so great that the company just has to pull the plug, regardless of the negative publicity (like Bora Bora, where people booked weeks of stays throughout the year).

So I can understand the desire to, if not keep these deals "secret", to not go out of one's way making them known so as to jeopardize the deal, period.

Of course, this topic has been debated long, hard, and passionately many a time in FlyerTalk.