A pity you had no maester to teach you. [Just kidding, maesters are the worst.] We are raiders. When there is something we want, we take it. That's the Iron Price. Where lesser men scrape the earth to earn petty wages, we take as we please with hardened steel and Ironborn might. Upon these seas, there might yet be a hundred harbors to pillage and claim.

[So fight? Oh yes, there's plenty out there to fight. People had an uncommonly vested interest in protecting their belongings.]