I have had a few HNWIs and UHNWIs whose only reservation with moving $500k or $1m into BitCoin is the lack of liquidity and scalability of investment so they settle with puny amounts like $25k or $50k, etc.
It's funny: some types of investor won't invest into bitcoin because the market is too thin to suck up their currency. They will probably invest their millions of USD when bitcoin trades around $100 saying: "finally this market has matured enough so we can invest, even using our comfy brokerage account". Had they just invested $100,000 now and blown $900,000 on drugs and women.. they would have the same amount of coins in the end.