I just had mine disabled after three years for no reason.. You can read about this disgusting event at my hub, if you're interested.
It is against their terms of service to create another account after the first one has been disabled.
But, the company, DoubleClick, which is a Google subsidiary behind this AdSense/AdWords nightmare are not, apparently, the most honest people. They will disable any account on a whim without having or giving any reason apart from simply wanting to steal your earnings, time and labor, especially right before quarterly fiscal reports are due. This is what happened to me, as far as I can tell.
It's probably better not to have anything to do with Google, inasmuch as that is even possible. ...if for no other reason than privacy. If you saw the news yesterday, you'll know why I say that. They have a new privacy issue in the news a couple of times a week, it seems.