In my opinion there's no "good" reasons for pulling out a demo, whatever it included. In my case I didn't have time to try out the demo because I thought they would never "remove it", like any other game demos out there, then of course I had been trapped, so I didn't want to buy it. Most of my friends with whom I played TF2 regularly bought it however, and they said "it's good man come play with it us!". It remained like that for three weeks, during which I kept telling them that I had absolutely no idea of how the game played, off-line or not, so there was no way I would spend $50 on that. Eventually one of my friends sent to it to via a Gift, so I was lucky about that, but otherwise, to be honest, I would have never bought it until a massive price reduction occurred.