I hate to disagree with you, due to your "liking" me and all,

but, I don't think it is nearly as ineffective as one might believe. Other then the obvious one of getting hard and fast fans back in the parks it also encourages others to start up
I love Disney sites in hopes of getting a chance at the same thing. The more blogs the more the message gets out and it is a basic marketing biblical belief that word of mouth is the strongest of all promotion. As I stated before, when you run the actual cost numbers, it is not really what you think it might be. Consider that the rooms they are giving away are empty anyway, now they are a tax deduction. Food, consider the markup on food. Almost no costs. Park entry? Doesn't cost them a cent but yet another tax deduction. Airfare...that might get costly, but I'm sure that Disney has a deal with one or more airlines for major discounted ticket thus filling those empty seats on an airplane. It is actually, in my mind, a pretty good investment.
I wouldn't go so far as to say that it has the return that a new ride would produce, coupled with massive promotion, but, for it's purpose I feel pretty confident that it more than pays for itself.
Now if you'll excuse me I must find out what it would take to start up my own blog. Disney is the greatest thing to ever happen to the world or even the universe for that matter, so I have this overwhelming urge to spread the word and hope that I can be
given, I mean have the opportunity to enlighten.