Gary Becker one of the world's top economists has researched this subject and is in favour of a market in organ donations :
My conclusion is that markets in organs are the best available way to enable persons with defective organs to get transplants much more quickly than under the present system. I do not find compelling the arguments against allowing the sale of organs, especially when weighed against the number of lives that would be saved by the increased supply stimulated by financial incentives.I am also - what do others think ?Wikipedia Gary Stanley Becker (born December 2, 1930) is an American economist and a Nobel laureate. Born in Pottsville, Pennsylvania, Becker earned a B.A. at Princeton University in 1951 and a Ph.D. at The University of Chicago in 1955. He taught at Columbia University from 1957 to 1968, and then returned to The University of Chicago, where he holds joint appointments with the departments of Economics, Sociology, and the Booth School of Business. Becker won the John Bates Clark Medal in 1967, was awarded the Nobel Prize in Economics in 1992, and received the United States' Presidential Medal of Freedom in 2007.
Personally it makes sense, it is an incentive for life saving action and Becker has performed research which shows it would work.
Also of course this could refer to people getting payment now in advance of their death, or for people selling one kidney etc.