Regarding prices and the flash sale...
I checked membership prices over the last week before the sale started, and at least for the Diamond Elite level and all of the add-ons, the savings for the flash sale are actually less than a dollar. It's still a great value, but I feel that this is one of those things that, even though there is a "regular" price, it will always be on "sale". I can't speak for the other membership levels or season passes, but I'm willing to bet that the prices won't be too much different after the "sale" is over. So I wouldn't worry too much if you miss out on this flash sale.
Anybody have any experience with seeing prices go up or down significantly?