Organ Transplant Rules

Bloomberg reports that the rules for who gets human organ transplants may change and might actually hurt children who need a human organ transplant.  Why do we have rules for human organ transplants?  We do not have rules for buying or selling cookies, and we certainly do not restrict the price to be equal to zero.  Rather we allow markets to bring buyers and sellers together to find the goods/services that are the best for each market participant.  In the same way, we could allow markets for those in need to search out compatible options for human organs.  Would it be an unfettered market - no.  There would be a plethora of regulations as there are now in terms of compatibility, but still provide a more efficient (save more lives) way of allocating a very scarce and valuable resource.