Maybe I misunderstand your post mrstickball, but are you only taking the three months ahead of the price reduction and comparing it to the three months after a price reduction?
You're always going to see a reduction in sales before a price reduction (if it had been rumored) and a boost after a price reduction but the boost is (usually) representative of people who didn't buy a system because they anticipated the price cut.
On top of that problem the timing of the XBox's price reductions has to be seasonally corrected because Q1 (January through March) is typically a very slow period in gaming and you start to see higher sales in Q2 and the price reductions happened late Q1 or early Q2 ...







