Because when you remove the financial incentive that leads to outright exploitation, there still remains the case where self-harm can be a moral action. Donati

Because when you remove the financial incentive that leads to outright exploitation, there still remains the case where self-harm can be a moral action. Donating a kidney, for example, or bone marrow, is harmful to the donor, but the trade-off is that it may save the life of another person. People make trade-offs that result in self-harm as part of a moral decision all the time. Firefighters are a great example of this. We (humans and societies in general, because this comment applies to all societies) generally block or allow moral and immoral activity based on the ability of those with power to regulate things. Some things are simple, like murder - generally, killing people is considered immoral, but even then, there is flexibility (for example, measures taken to stop an attacker from causing harm). Some things like organ donation are considered moral complex, and demand extra focus to prevent exploitation.