A lot of great games on those lists. They were fun when we beat them over 5 years ago :P
A lot of us have already played/owned them before. I can't speak for everyone, but I bought my 9 games mainly because I'm a collector and enjoyed most of them in the past and warranted a revist for only ~$3 + change. I had a massive 360 collection but after Microsoft's abysmal E3 showing last year, I sold off my 360 and all my games. Since then, the PlayStation platforms have remained my "primary" consoles (e.g. what I buy all multiplats for), so there are a lot of multiplat games I sold off for 360 that I'd still like to own for PS3, just for consistency's sake. I have an Xbox One, but it's solely for exclusives.