While this makes perfect sense, I think this misses the point of what they are trying to do. If they offer an AP discount to people buying direct or those who have bought direct, how does this drive more business? I have a resale contract, am I going to go spend another 15k on more points I don't need to get an AP discount?
I think this will be the most subjective, non-offensive concept applicable: Tiers based on points. 1-250 pts will probably stay the same. 251-499 will get some benefits, AP discount of 20%, 200 day booking window on dining, 1 free fast pass per day-per traveler, etc...(these are obviously just examples, not anything well thought out or concrete).
500+ pt holders will get a 12/8 booking window, 50% AP discount, 1 free dining experience per trip, 2 free FP's per day per traveler, 360 day dining reservation window, and an exclusive reservation number to call, no waiting.
Ultimately it's not about them creating tiers, but creating enough incentive to drive somebody from the lower tiers into the upper. For this reason the delineation won't just be 2 tiers, there will probably be 3. They don't want the people with 150-200 points to find the 500 pt threshold unattainable, so they will make a mid-tier.
But the key is the incentives. This won't be designed to punish anybody, only reward those who spend more buying direct. But this is a tough economy, and many are tapped out or don't need more--so they need to make it worthwhile. If they think a few token perks are going to get people to rush to spend thousands of dollars, I think they'll have missed the mark.
(Disclaimer: What do I know!)