Why do need to sell if he can make himself hella rich on his own? This is
100% scam not too obvious.
You're right though, but may looking at it from a different angle, seems like he has a lot of it cause he said that he wants to sell to two people. But, I don't think anyone is going. To trust him with this, cause they are going to be thinking the same thing just like you have said here… why wouldn't he continue making use of it or maybe give it out to his friends?
I can imagine if I had a stuff like that I would save about two of it for myself while the remaining ones I might decide to sell to my friends after I have showed them how it works and proven that it works so they can also make money as I make mine.