Not currently on capital
> But someone with $10M will be able to get the same risk adjusted return as someone who has a net worth of $100k.
That's exactly what Piketty has shown to be false. If you look at stuff like endowments and sovereign funds you'll see gains that are nowhere near what's possible even for funds that have $100M in capital.
There are economies of scale involved here, both in diversification and in management. Moreover some markets are not even available to investors who are not larger than a certain threshold.