Same reason as me, I bought a copy to keep sealed (sad i know) as i heard that when GT4 is released they'l stop production of it.
You'l have to tell me what you think, the 5th track is fantastic. Bombing around a town with windy roads/steep hills and large dips....GREAT FUN
I've been off games for about a year now, nothings come out that has really given me that 'school boy' feeling when you play a fantastic game.