..Always exchange is a game, the rules and trading power change every once in a while...........
IMO, this is the real danger in buying a cheap resort to exchange into more expensive resorts. For that matter, it's the risk of buying any resort just to exchange.
In 11 years time I've seen the landscape change and, in order to keep my options where I want them, I've had to make changes right along with them.
Our Polo Towers units were GREAT exchangers when we bought them. They ALWAYS recieved an AC when I deposited, even if it was just the one bedroom portion of our two bedroom lock-out units.
Now, with the opening of Marriott's Grand Chateau and the soon to be open Westgate Planet Hollywood, exchange power has changed. Sure Polo Towers is still a great resort in a great location but, it's a resort that was built in the '90's. The Marriott and Westgate have essentially the same location with newer/nicer amenities.
Originally purchased to use, our needs have changed and all we do is exchange our Polo Towers units. To compensate we placed both our Polo Towers units into DRI's points system. One year after doing that Interval International changed the amount of points necessary for an exchange. They put in seasons and increased the number of points necessary for high and premium seasons plus, they added catagory's with higher amount of points needed for 3 and 4 bedroom units. So even though I thought I was protecting my exchange power, the system found a way to degrade it anyway.
Buying to exchange might get you what you want for a little while. It might get you what you want for a number of years. But in the end, the landscape will continue to change and what works today might not work tomorrow. If it's someplace you really want to go on a consistant basis you should buy the quality you want in the location you're most likely to want to return to year after year. This appears to me to be the best way to weather the changes that are bound to happen from time to time.