Every other suicide method has a higher chance of rendering an individual comatose, disabled, or permanently disfigured. The side effects of a failed first attempt would be an incentive for the pursuit of a successful second.
> Seems like a buyback could reduce the opportunity for deaths and injuries due to suicide attempts.
Attempting to reduce deaths will only increase permanent injuries. That will certainly be a burden on the medical system which comes as an added expense on the willfully living. If people want to kill themselves in the least painful and most effective way they can afford, they shouldn't be prevented. It's tortuous to deny a person the right to dispose of his own life as he sees fit by means of his own property.