It's not "that" logic, I said those guys were making money with adfly, not you.
On the other hand, there will still be a lot of people paying for MUGEN, not everyone knows the engine, and sometimes, even though they have already heard about it, they have no idea how it works. Just remember the case in the "Mercado Livre", some people actually bought the game TQH0 that was sold for that scum. Bandits take advantage of any opportunity.
The dream is nothing yet drive us to the end.