the first thing is to explain how it was created and the creator's idea, why it was created and what are the benefits
if you make the investment part first chances are people will look at it as a Ponzi Scheme and they will shun it.
I doubt that you can get away with the investment explanation in the beginning here. I mean people doesn't care about the technology behind, all they wanted to know is that how the hell cryptocurrency is going to make them rich. I've tried the approach you mentioned, but it doesn't work to be honest. I guess people are afraid of everything new, unless there's some form of investments or returns in the end.