Quite a few that the students ride in on.
You can't stop people from buying them as starter bikes, so why not prepare them for the realities of high insurance rates, expensive tire changes, and a multitude of speeding tickets?
The other concept has people following the British method of limiting cc's until a time constraint has been met.
Or suggesting to someone with good coordination and aptitude that they start on a bike that doesn't meet their commuting or touring needs when by rights they are capable of handling a larger bike like an FZ6 or Bandit 650, Kawasaki ER6, VStrom 650, F650GS or CS.
I'm on a budget, so buying and selling bikes isn't something I can do readily, so I tend to live with my choices longer.
The Deuce? Well, if we started talking about your poor clutch control and braking habits... Perhaps a tricycle would be better to start on.