Then there was the amount of trouble he attracted after killing the Count. Thorin came for him and about a hundred thousand people became idiots.
Those hundred thousand people were just collateral damage. There was also the many people he killed so that he could take over their apartments and turn it into a safe house. Those safe houses were also rugged to explode, which many of them did.
So there were indeed a large amount of loss to lives and property in the process of acquiring the Life Steal ability. When compared to be being a bounty hunter for a few months, the cost of Extraordinary Perception seems acceptable.
He shrugged and said, "High risk, I reward. But that might not be so in the future. In the future I will have a cabal, and they will do all the work for him. So I won't need to take high risks to get high rewards."