I think there are discounts, but I think they are limited. I think only 2% of the available rooms are made available to CRO in the first place, so discounts would have to come out of that 2%.
You can probably save a ton by renting points from a DVC member. For example, a studio at OKW during value season costs $269. The average amount to rent points is $10/point, and it is only 8 points to reserve an OKW studio Sunday night-Thursday night, which is just $80!! (the number of points goes up on the weekend, but it's still less than $269!)