Well, I think we shouldnt rule out already existing investors. For example, mostly Im practicing long-term trading strategy, but from time to time (when I have such possibility) I buy some more coins. Each time I'm buying 'em I transfer small amount of coins to the cold storage at cex (
https://cex.io/) for the purposes of trading, but the biggest part immediately getting transferred to my hardware wallet. So old investors dont sit on their hands too.