Sony probably pay less money for the 80gb drives than the 60gb ones. I reckon the 80gb drive is more in demand at the moment than the 60gb one - not just for PS3s but for laptops and other devices. This means that manufacturers have ramped up their production of the 80gb drive and reduced production of the 60gb one. Therefore they can offer the 80gb one for less money due to the savings associated with the volume of manufacture - i.e. "economies of scale".
Why else would Sony be switching over to 80gb from 60gb? It's a heck of a lot of effort for them to just offer an extra 20gb.
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