ICB? The Insider Community Board? Huge difference. The ICB (at the time, at least) was only open to paying subscribers (insiders) and mods. There was a barrier to entry, which led to a generally less-unpleasant userbase. The Vesti never had a barrier to entry - anyone could post and anyone could make new accounts at will, meaning there was no accountability for misbehaviour (either you're misbehaving under a mup and if you lose the account you just make another one, or if you misbehave under your main you just abandon it and make a new main and continue misbehaving).
When there was a monetary attachment to an account (as in the ICB), fewer asshats get in and those that do have something to lose if they get caught misbehaving.
Now, waaaaay back in the day there was the IGNCB, which had no genuine barrier to entry itself, but seemed to exist in a time before asshattiness became so prevalent on internet forums.
Hell, this board doesn't have a barrier to entry anymore, but it seems to have avoided the "everyone simultaneously trying to be the alpha or the jester" problem that has made the Vesti what it is.