I, too, have wondered about the inconsistencies in AARP Rewards.
In some ways, those of us who were in the AARP Rewards for Good program were spoiled by the consistency in most of the activites and benefits. We knew where to find things and how many points we could get for finishing the activities and how much things would cost in points and cash, if any. We also knew where we stood with points.
AARP Rewards doesn't seem to be following any pattern in points earned and redeemed nor in the discounts on available gift cards and such. Each new offering is a surprise, both in its actual description and cost differences from other similar items in points or cash. The assignment of the costs for the items seems more to be contingent upon somebody's personal whim at the moment and less on any historical precedent.
If you're not confused, you haven't been paying attention!
Surprise!
Enjoy!