I've slowly and unintentionally lost touch with almost every one of the people I spent 7 years of my life with, both in and out of game. To go back and not see them there... it would be like driving home and finding your family gone forever. No explanation, no security of even knowing if they're OK or how their lives are going, and you know nobody can ever take their place. Would you open the door and walk back in to face that, or just keep driving?
As much as I loved and still love FFXI, returning is emotionally not even an option. It may be just a game but the bonds we all had weren't. I thoroughly regret that they ever broke, and I don't need or want any reminders.
That's just me, but I doubt I'm alone.