There was a film made some time ago in England that's relevant here.
If you are going to sell your organs by signing up for that $400, you have to be ready to hand them over when required.
An alternative could be to move to China, where the government owns all your organs and is free to sell collect them and label them any time it
wants.
- Unless you are a dog or cat, in which case your organs can't even be used to make soup anymore, thus proving the government really does care.

