Re: Now, home boxes, that's a different matter.
Your choice of words is appropriate. They *won't* know a port *when* it pwns them. If your game needs to allow anyone, anywhere, sight unseen, to access your network then you need a new game. People need to learn that the easy way (from us) rather than the hard way (from their bank).
Many games use P2P multiplayer. Someone somewhere's got to open a port.