Well this does kind of make me nervous about starting another thread...
I still wonder though. I've seen a couple of members who have been here longer than a couple of years who suddenly go from seemingly rational people to having an almost psychotic break. Anger, hatred and poison just oozing from their posts. They know that this behaviour will get them banned. Isn't there a classier way to leave?
There are countless ways to leave, but this behaviour may not be to get themselves banned... I've been here 5 years next month, and I know that if I go through my post history, I can certain events both on and off the site based on my posting style. At times, it's a wonder I wasn't banned!
Those who knowingly change behaviour to get themselves banned though, and go as far as you say to achieve it, probably do so because they know if they just left, they'd come back, if they closed their accounts, they could start a new one, and if they just played up a little, or did some other non-disruptive breaking of the ToS, chances are they'd appeal, explain and then come back...