Keep in mind that it's not the pharma companies that are the only, or even most notorious, scammers that would benefit. Families of the dying one are a major risk factor. The difficult[0] truth is, plenty of families would accelerate the demise of a terminally ill or elderly[1] if it were possible. Like with euthanasia, any elective experimental treatment that carries increased risk of death, could become something the patients get pressured or manipulated into by their families.

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[0] - The situations can be ethically and emotionally complex, so I'm not passing any generalized judgement, other that this is something a person might be concerned about when contemplating the possibility of ending up in this situation in the future.

[1] - Arguably the same thing, but that's another topic.