I think you will find life support is not pulled before the organs are harvested. The organs they want most need the blood flowing to them.
As far as selling one’s organs. It would be disasterous. The poor would go first and granny would be expected to go next to save any inheritance.
My husband was given a heart transplant 18 months ago. He was dying, they had done all they could do. He was then placed on the list a1 status.
We are not wealthy, we have no connections. We prayed and God gave us his answer. Every day we are grateful to the donor for having the courage to be a donor. We know very little about the circumstances of his or her death, we just know there was a brain death. Rather than a vital organ being disposed of at death, it gave life. Our family s once again whole and we are truly blessed. I know, beyond a shadow of a doubt, that this was a gift from God.