[konschubert]

Why don't you go invent a cure for HIV then, and do better than the existing Pharma companies?

[theblobawakens]

He will do morally much better, if he succeeds in funding the development of said cure, and in actually making it.

But he will be competing with more interesting propositions, investment-wise, in he form of subscription drugs.

Ergo, "why ?" is "probably because of money".