But you, keep yourselves from the things devoted to destruction, lest when you have devoted them you take any of the devoted things and make the camp of Israel a thing for destruction and bring trouble upon it.
Joshua 6:18

Bringing wickedness or even the harvest of wickedness into the camp will destroy the camp. God's way often doesn't make obvious sense in economic or practical terms, but it is still always more economically and practically beneficial whether we understand it or not. The real gold, silver, and bronze, though, is in the eternal rewards of a life lived in humble obedience.