Dean...as always you are a great source of information! Thanks!
I understand your point though about not buying DVC just for the trading factor. Hey! If it was only up to me we'd only vacation at the most magical place on earth!

But like flechette said...DH doesn't always like to go to WDW...and DS wants to see other places once in a while or start taking a friend with him on a trip to WDW (whew! gotta think that one through), so we might use the exchange once in a while. I just like gathering as much info as possible. I'm thinking we just might be able to plan ahead...personally, I prefer to plan well in advance, but with DS starting high school next year we will have to acclimate to a new school calendar. Also, this is our first year as members so I'm still learning all the ins and outs of how to maximize our DVC membership. I know we will use it to go to HH and VB and we are actually using some points to go to DL this summer.
In any case, the info you have given is valuable...gives me an idea of which times might be easier to get that exchange when we do want to give it a try.
Thanks again!