Talking to CNET, Sony has revealed why the PS3's November sales were actually lower in 2008 than in 2007, despite an upward trend for other consoles across the board. It seems that the introduction of the 40GB model and a new lower price in November 2007 was too successful, meaning that the PS3 was unable to compete with itself even a year later. What Sony forgot to mention is that the cheapest Xbox 360 is currently selling for half the cheapest PS3's price.
Sounds obvious, doesn't it? Price cut equals more sales. Maybe if Sony had done the same thing in 2008 the PS3 would have outsold its own year-old ghost (that's a racing game metaphor, not a Christmas Carol "Ghost of Christmas Past" one).