APB IS the only reason I still have a PC in my house (I was going to get a new MAC as it fulfills every other thing I do but it wont run APB so..). I have no other games installed on my home PC. BTW I work in IT, make PC games and websites for a living and I have NO other games installed on my home pc.
I dont know why I have stuck with APB for so long. Probably because I know some people who worked on it back in RTW times (I live in Dundee - my office used to look directly in to the windows of RTW so While my minions were working away I would stand at the window and wonder what they were building right now on APB) and its nostalgic or maybe because I was looking for this exact type of game when it came out and its always scratched that itch ever since (although I did stop playing for about a year when Tiggs the fuckin tard got me banned from the forums for no reason WANKER!).
And of course its fun