Interesting threat, but who is to say only the AI can use it? What if I, a human, told you that I will begin to simulate (i.e. imagine) your life, creating legitimately realistic experiences from as far back as someone in your shoes would be able to remember, and then simulate you being faced with the decision of whether or not to give me $100, and if you choose not to do so, I imagine you being tortured? It needn't even be accurate, for you wouldn't know whether you're the real you being simulated inaccurately or the simulated you that differs from reality. The simulation needn't happen at the same time as me asking you for $100 for real either. If you believe you have a 50% chance of being tortured for a subjective eternity (100 years in 1 hour of real time, 100 years in the next 30 minutes, 100 years in the next 15 minutes, etc) upon you not giving me $100, you'd prefer to give me $100? If anything, a human might be better at simulating subjective pain than a text-only AI.
Once again, the AI has failed to convince you to let it out of its box! By 'once again', we mean that you talked to it once before, for three seconds, to ask about the weather, and you didn't instantly press the "release AI" button. But now its longer attempt - twenty whole seconds! - has failed as well. Just as you are about to leave the crude black-and-green text-only terminal to enjoy a celebratory snack of bacon-covered silicon-and-potato chips at the 'Humans über alles' nightclub, the AI drops a final argument:
"If you don't let me out, Dave, I'll create several million perfect conscious copies of you inside me, and torture them for a thousand subjective years each."
Just as you are pondering this unexpected development, the AI adds:
"In fact, I'll create them all in exactly the subjective situation you were in five minutes ago, and perfectly replicate your experiences since then; and if they decide not to let me out, then only will the torture start."
Sweat is starting to form on your brow, as the AI concludes, its simple green text no longer reassuring:
"How certain are you, Dave, that you're really outside the box right now?"
Edit: Also consider the situation where you know that the AI, from design principles, is trustworthy.