Now I tend not to follow this form very much, so please excuse me if this has been suggested before. Still, I don't know that there's anyone else on this board who could actually carry out these threats.
If anyone accepts a pascals mugging style trade off with full knowledge of the problem, then I will slowly torture to death 3^^^^3 sentient minds. Or a suitably higher number if they include a higher (plausible, from my external viewpoint) number. Rest assured I can at least match their raw computing power from where I am. Good luck.
EDIT: I'm told that Eleizer proposed a similar solution over here, although more eloquently then I have.
I think you're getting at an important problem, and have taken a step toward the solution.
How do we deal with choice in the face of fundamentally arbitrary assertions?
One way, at least, is to see if there is another equivalently arbitrary assertion that would lead you to make the opposite choice.