If you are donating body parts, it is not an issue. But when you are making a business out of your body parts, that's where the issue is. It is not bad to donate your body part to save a life. Selling it for money is the problem.
i totally agree with your point. Donating body parts is like saving and helping someone which is good. But when you sell them because of your need of money then its wring and it should be banned by the government.