"Because we can and it's free"

This. well, not this specifically, but the easiest and best way to make money is to educate yourself on what might be in demand after a patch and to stock up on it in advance.

The week before the Crimsonwood patch, when we knew that we were going to be able to make our own weapons, I started stocking up on Steel Plates (from Iron Boar armor). I was a bit disappointed when I found that they weren't required to forge Crimsonwood/Raven weapons. : (