Right- but the dates you mentioned are both classified as "value" season- yet one is $11 less than the other one that also has a 35% discount added to it. Conclusion? Pricing means nothing except for trying to find the best deal- which fluctuates all over the map. You didn't do anything "wrong" with your 10 day stay- pricing is just higher. And- by now and October- I'd wager that price will drop.
I'm looking into booking at Sapphire Falls right now via Orbits for a labor day trip- and its $430 for 4 nights w/ my orbitz bucks and a 15% off coupon- but also, they are running a $150 food/beverage credit.
So now I decide- do I stay at Sapphire Falls for 4 nights for $430 + F&B or my go-to Royal Pacific for 4 nights for $652 w/o the credit. $220 (+$150) for express passes and the best restaurant on property. Decisions, decisions.