The problem is not that the teenager decided to sell off part of his body. Teenagers (and adults) make stupid decisions all the time.
The problem is that a hospital, surgeon, transplant team, theatre staff, etc. can perform this sort of elective procedure in the first place.
If you at a government-level allow elective organ donation for cash, you can't then complain about who takes up the offer or what they spend the cash on.
(The hospital say they knew nothing about it, so either they're lying, or they have such awful administrative procedures that they don't even know what happens in their own premises -- either way it's not good).