I mean what are they waiting for? The fact that the market cap isn't 12 figures is a joke.
I think there are several factors as to why they are not (yet) willing to invest their money into Bitcoin.
I'll list a few reasons;
- Still too many large holders (early adopters) with insanely high coin stashes, with Satoshi as perfect example.
- Mark Karpeles still holds around 500,000BTC somewhere. Don't forget that he before the theft also had like 100,000BTC from his own.
- Hacks with large number of coins getting stolen.
- Volatility.
- Market isn't liquid enough for them at the time they want to pull out.
And surely there are more reasons, but these come to my mind right now.