Because if there's anything a man like myself would honor, it would be a deal such as this. I never go back on my promises-- or have you forgotten the last time we made such a deal? I came through with the silver I promised, didn't I? Even though it would have been a simple matter to walk away and let you assume I was only using you.

[Okay, he was using him either way, but at least he got paid for it.]

Ah, but in the interest of fairness, I suppose we should decide what I would get if you fail to detect my presence. Just what would you be willing to offer, I wonder?