Look at the WW sales for the PS3 in the first half of 2007....
VGChartz Hardware data for the period 31st Dec 2006 to 23rd Jun 2007:
Console PS3
Total 2,441,854
Same period, in 2008:
VGChartz Hardware data for the period 30th Dec 2007 to 21st Jun 2008:
Console PS3
Total 4,713,050
And Note: those are Worldwide numbers, and if the PS3 managed to that much in early 2007 was because of the EUROPEAN LAUNCH (you know launches sell many consoles).
You could extend the period for this comparison to October 2007
VGChartz Hardware data for the period 31st Dec 2006 to 06th Oct 2007:
Console PS3
Total 3,764,447
And the PS3 still didn't sell what it did a year later in 6 months (1 million difference)....
Ta-daaaa, that's price cut for ya!