Our stated preferences are predictably limited and often untrue accounts what actually constitutes our well-being and our utility to those around us. I'm not sure I want to wake up to a god psychologically incompetent enough to revive people based on weighing wishes greatly. If there are resource constraints which I highly doubt it's especially important to make decisions based on reliable data.

When I say something like "if it were free and you knew it would work would you sign up?" some people have said "no", or even "of course not."

I think this much more likely reflects the dynamics of the discussion, the perceived unlikelihood of the hypothetical and the badness of death than actual preferences. If the hypothetical is improbable enough, changing your mind only has the cost of losing social status and whatever comforting lies you have learned to keep death off your mind and not much upside to talk about.