I could be wrong, and forgive me for butting my nose in... but i think those values were based on the redemption options.
I am only guessing this because I've redeemed 2200 Pampers codes for 2x $10 Starbucks GC's (1,100points each). On the huggies site you can redeem for a pull ups FPC at around 375. The max value on the pull ups FPC's used to be $14.99, however I just received a new one the other day that expires in 2013 and it has a new max value of $16.50