using the in-game currency is a good idea! and yes I agree, that is what making it hard for them to understand it when they refused to understand it. The worst I've met was when they asked about it and then when I started to explain it they will condemn it even though they have no idea what cryptocurrency is all about.
I need to hear that story from @bitrocker2020 it must be very interesting :)
Something a mentor taught me a long time ago - SW SW SW
Some Will, Some Won't, So What?
We can only move on.
That's a very good motivation!