My local EB got about 40 kinects when their shipment came in. Of course they sold most of them quickly, but when you count in transit and other stores (like best buy which gets 100 at a time) and 10,000 + total retail locations (gamestop, walmart, target etc). There's going to be a significant difference in actual sell through vs shipped, probably more than 100k units in any event.
I have no problem with them using shipped numbers,and I'm sure they are fairly close to sell through but they are not the same regardless of what they would like you to believe.
The diffrence is those are not normal shipments. Gamestop is getting them because gamestop sells them before the next shipment. Once they no longer sell what they get in shipments will shrink. PS3 is about 2 systems per week for gamestops in my area