I believe its the fact that the forum hasnt got 1000's members and you get to know each one on here personally through his posts. Most forums have like 5k members and barely know each-others nickname. I dont usually come to the forums to get help from you (when i need help, i do :P) but to see how you guys are getting along here.
I believe if you are one of the active members of any friendly forum, you 'll always come back until it down.
This is hte only forum i keep coming back to...