Is the expected number of people you'd save by doing that actually greater than 1?
I checked the numbers on this recently. An average heart transplant costs about 1.1 million dollars, and has a mean survival time of about five years (at a very poor QoL). I think there's a pretty strong case that they shouldn't be done at all.
Kidney transplants have a much better RoI, but they don't require the death of the donor.
Here's the new thread for posting quotes, with the usual rules: