This note from Josh @ easwdw pretty much sums it up.
"Disney artificially separates its resort classes by limiting amenities at its Values that no other hotel chain on the planet would dream of getting away with. Could Disney have built water slides at Art of Animation? Absolutely. Did they? No, because they need to artificially separate the resort classes. Should there be a $15 plastic coffee maker in every single Value room on property? Absolutely. Is there? No, because Disney needs to artificially separate its resort classes. There’s much less of that at Cabana Bay, where you’ll find a water slide, water features, hot tub, kids’ water play area, sandy beach areas surrounding the resort, and more."
Disney has to create a reason to get you to spend almost twice as much at a moderate or 4+ times as much at a deluxe. Location is one way and they certainly use that to their advantage but beyond location the only way to differentiate is to adjust the amenities. "Upping their game" at the deluxes could be costly BUT on the other hand taking amenities away from the values is easier and cheaper.