I think it's past time for another Stupid Questions thread, so here we go.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Please respect people trying to fix any ignorance they might have, rather than mocking that ignorance.
You don't have to be sure that infinities exist to explore the possibility. Have you looked at Nick Bostrom's paper? Do you think Bostrom was wasting his time?