I'm reminded of something that someone pointed out re:
free dining promotion. Namely that (IIRC) the individual hotel managers basically pay for the dining packages and decide how many rooms to offer and on what dates, within the overall terms of the program.
If DVC is offering a special Typhoon Lagoon evening, I gather that the DVC management is "renting" the water park and offering it to points holders presumably in order to enhance sales of new units, discourage re-sale of existing units, or whatever.
I'm pretty ignorant of DVC but I suppose that technically the bonus entertainment is available to people who signed on the dotted line for DVC, even if they sell or rent out most of their points, most of the time (or whatever you call it) ... and not available to people who merely stay at DVC because they are essentially renting a room? And what about people who bought DVC at some non-WDW location but can use points or trade them or whatever to stay at WDW?
DVC seems to me to be a fairly confusing muddling of the concepts of "membership" and "property" with aspects of a shell game (to be frank). Is the goal to fill the rooms with guests, in which case the premium should apply to anyone staying at a DVC, or is it to "move" units, i.e. sign up every possible "buyer" or "member" or "owner" and to heck with the rest?