A death is traumatic. Generally there should be a compelling reason for someone to want to come back. Which is why its usually hero's. They have unfinished business like saving that princess or the world. Commoners might have a few things to look forward to like children being born or people married, but lets face it, none could ever hope to afford being brought back. Those who are rich can afford it, but lets face it, nobels would hate for the king to keep coming back until old age finally claims him so likely there are laws about those back from the dead gaining positions of power (this comes from a web comic called Girl Genius).

But anyways, no actual reason is really needed, because honestly, who understands the dead? Their motives are no longer our motives.

A death is traumatic. Generally there should be a compelling reason for someone to want to come back. Which is why its usually heros. They have unfinished business like saving that princess or the world. Commoners might have a few things to look forward to like children being born or people married, but let's face it, none could ever hope to afford being brought back. Those who are rich can afford it, but let's face it, nobles would hate for the king to keep coming back until old age finally claims him so likely there are laws about those back from the dead gaining positions of power (this comes from a web comic called Girl Genius).

But anyways, no actual reason is really needed, because honestly, who understands the dead? Their motives are no longer our motives.