Unlike the Doctor, Jack was very experienced in this sort of thing, because the universe as a whole in the fifty-first century still revolved around money. While Eight took the most important of questions, because they were both concerned with where this sentience would end up, Jack took to the negotiations the Doctor probably wouldn't: "How costly is costly, Balthazar?"

But he wouldn't be happy about it. A conman getting conned is never happy about it.