1) The game is NOT full price. Full price is £49, the Prologue costs only £17.99. That is under half, full price games.
2) The game is only £17.99. A bargain.
3) 70 Cars, 6 Tracks, 16 Player Online Racing is NOT a demo. A demo would be one track, a car or two, and no online component.
4) You are not being forced to buy this game. If you can't wait for GT5 (much like myself), it's a very sizeable offering to hold you over.
5) If you disagree with point 1-4, simply Don't Buy It!!!. It's your lost.