Trade isn't about goods. Trade is about information. Goods sit in the warehouse until information moves them. See image C. J. Cherryh
A warrior is free to be a hero and pull off daring do and the soldier is irresponsible if he does it. See image C. J. Cherryh
The warrior may fight for gold or for an immediate gain, or for something to take home for the winter to feed the family. The soldier is part of a more complex society. He's fighting for a group ethic of some sort. See image C. J. Cherryh