Now, don't get me wrong I love installing my Games to the HDD, and I know it was to increase read times for the game media while playing. It also quited the god awful sound of the DVD-ROM, but I feel there might of been a 3 fold reason. I have a 20 gig HDD, and I now feel that I "need" bigger.
I currently have room for one game install, and I am finding my self deleting GOW2 to install RB2 visa versa consantly. I think I have the perfect stocking stuffer for my wife (who never plays or cares about the 360) j/k. I am sure I am going to pick up a 120 gig ASAP. Microsoft makes bank off their HDDs, and pretty much ever accessory they sell.
Agree or dissagree, it's just the man getting what he wants, and getting me to upgrade a part (HDD) to something I did not think I would need to change out when I got my 360 earlier this year.