They say it is not an investment because "it has no yield".
Really?!
I know many people who got rich without investing then.
Actually, investing is the same thing as speculating. So whatever you've sold more expensive than you've bought is an investment.
Stocks or currencies, doesn't matter; at the end of the day, it's all about speculating on a future higher price given by human interaction.
Don't pay attention to specialists on mainstream media, they don't undertand Bitcoin. They see it as an internet diversion.
While what we are witnessing is a monetary shift. Keep that in mind.