They really don't. Ships were a massive expense and quite prestigious and often supply limited. No dirty peasant is ever going to be able to purchase one. A rich merchant sure, some guy walking out the forest covered in blood with a bag full of gold, unlikely. You also need to remember that the act of a advy leaving his home realm results in a auto ban. Following that logic what do you think would happen to anyone that provided the means for them to leave their realm and continent?
I think that Shizzle illustrated my point much better than I did.
