I play the odd computer game and once I figured out that waiting three months after release halved the price of most boxed games I found I could even afford to play them. My biggest problem has been trying to read the system specs written in 2 point Myopia font on the bottom of the game boxes, but now I've found a website that will do that for me. Well actually its the other way around. The 'CanYouRunIt' site reads my computer specs and advises me whether my PC will support a game selected from their list.
Their list is not exhaustive - no sign of the Diablo franchise (but I already know I need a new computer before Diablo III arrives sometime within the next three years). Still, it's a useful site to bookmark.