So you haven't explicitly stated this, but I'm reading into your comment that the early bitcoin investors made a lot of money ergo it is a good investment. That argument isn't sensible, and if you are making it I caution you to stop.

We can all point to examples where:

1) something was valued low,

2) then it was valued high, made the people who bought it low rich

3) crashed and lost the people who bought it high a lot of money

Mine is Isaac Newton's bankruptcy because he has some name recognition.

And further we can all point to examples where people did something stupid, got lucky and benefited from it. Hacker News is a reasonable place to ask, because it is a good crowd to assess bitcoin's technical aspects.