Christians or others - Why do or don't you care what you look like after you're dead?

Knowing my family and tradition they'll want to bury me. But I really don't care so much. I'd rather not have my children needing to buy a costly coffin. But I mean I would rather not have my body harvested of my organs for science. I'll probably just get cremated and they can bury my ashes in just a patch of woods. Plus cremation prevents zombies!