True, but there are other choices that may be worthwhile for $400ish. I figure out where we want to go then look at reviews of whatever is available in Interval, then compare those resort codes to the list of exclusions. I agree that it's tedious, but once you get your "list" it's easy enough to cut/paste the resort codes. The most time consuming part is getting the T&C in any kind of useful format. I copy and paste it into excel and use that as a starting point but it is unnecessarily tedious.
Also, Marriotts and DVC will occasionally be available with an AC (and AC for deposit definitely has more trading power than the generic ACs) but those will be last minute. For an OGS there's no point in trying to add them - they are almost always listed as unavailable in the T&C and will make you start your OGS again. Those will be something that you will have to look for manually.