I've thought about this a little more and the dynamics that make this work.
I think it boils down to people having actually met some of the other members from the forum in person (which means I need to get my butt in gear)...and as we all know, people tend to act more sincere and genuine when their identity isn't concealed. Take into consideration that the average Busa owner is probably gonna be a little more mature and educated than the average rider, new members are quick to follow suit when they see the generosity and respect shown by longer tenured members when they join.
Like I said before, I need to be more active in the MnGs, but I think that plays a huge role in how sweet this forum is.