DVC members are eligible to purchase discounted Platinum and Platinum Plus annual passes. Are members who purchased those passes, using DVC discounts, excluded? You're right, it's not debatable.
I suppose many DVC members purchase lower priced annual passes with some blackout dates. It kind of makes sense to black out what is expected to be a very popular advance event.
Disney could make any AP pass holder preview a VIP experience. For $$$ you'll get preview access, a light saber and/or droid and maybe even a meal. First offer it as a package including 2 or 3 night hotel stay. Offer just the free preview if there are any left.
Give it another year or so and we might see these kinds of preview packages.