You have a good point there! In time, the concept of selling organs becomes even more insidious.
Allowing a person to sell his organs makes his organs just another asset. When that person then declares bankruptcy, the creditors are entitled to his assets. Could that person then be forced to sell off his assets (body organs) to settle the debt? Probably not in the near future, but with the way things are going, a law would be written to mandate just this.