I don’t think of my family members’ corpses as commodities I “own” or should be allowed to sell for profit. But if I did, my family members might be reasonably concerned about me having a profit motive to turn them into corpses. For example, you could have a situation like
Doctor: Your mother’s condition is critical. Would you like us to proceed with the operation?
Me: (Flipping through medical catalog) Can I get a quick appraisal on her kidneys first?