Because of the global organ shortage, thousands of patients die unnecessarily each year for want of a kidney. And because organ sales are illicit, corrupt brokers may deceive indigent donors about the nature of transplant surgery, cheat them of payment, and ignore their postsurgical needs and long-term complications. The only way out is to increase the supply of available kidneys – whether by a cash payment to potential donors or through some other form of compensation.
John's note: While I'm not 100% convinced, the argument is logical and is worth a thorough debate. Here's additional Reading on this topic: http://www.cato.org/pub_display.php?pub_id=8755