post is answered further down the same page:
"Oftenest they were in service. He had reckoned on this when he spared Dynaborg. Word got around that this was a dreadful band to fight against but sensible in peace and trustworthy. Kings throughout Gardariki needed men like that for their wars with each other and, still more, against the wild tribes that galloped in from the steppes. Traders needed guards for the laden fleets that yearly went down the great rivers and back up again. Hadding's were worth high pay." (pp. 89-90)
They get high pay and loot with which they become shrewd traders. Some buy farms. Hadding becomes rich, then buys ships, weapons, stores and goods to give as gifts and hires men. He aims at kingship. Thus, Viking fighting skills have been put to a variety of more productive ends.