Agreed.

Here's an idea that just occurred to me: you could replace Solomonoff induction with a more arbitrary prior (interpreted as "degree of caring" like Wei Dai suggests) and hand-tune your degree of caring for huge/unfair universes so Pascal's mugging stops working. Informally, you could value your money more in universes that don't contain omnipotent muggers. This approach still feels unsatisfactory, but I don't remember it suggested before...