The trick behind PS3 to sell it was to make it available in low quantity and make it exclusive kind of thing, so that when next batch arrives it will be sold in a day.

Wii did the exact opposite of this they made all there 600,000 consoles available on the launch day and guess what … They sold there entire batch, seems like people at sony need to rethink there strategy or they are going down.

Btw i pulled up this nice userbar from nexgen site which shows number of consoles sold so far.
nexgenwars.com
nexgenwars.com
nexgenwars.com