Thanks for the reply. However, in order to disprove voluntaryism, you need to prove that you can properly delegate a right that you don't have. Can you do this? You have to be a moral relativist to hold that position. Are you a moral relativist?
By arguing that it would be more expensive, your not disproving voluntaryism. Also, holding the manufacturer liable is something you said, not me. You created a strawman argument and then disproved it (sort of).
If you're saying voluntaryism wouldn't work, what your really saying is "I can delegate rights I don't have to others", which is flawed. You have to prove that you have that ability, then we would actually be having a debate about voluntaryism.