0. Just to be fair I think any discrete time auction would reduce HFT. No matters less if it will be 100ms or 15 minutes. Just a parameter that you can optimize based on your market.

1. Not all startups are equal, but quite a few will create some lasting value.

2. Unsure if most of this career alternatives will ever give that sort of gains. The question is where the gains come from? Inefficiencies in trading strategies of your retirement fund? Maybe those inefficiencies are always present if humans type orders? Maybe we should design stock market with human first approach, not HFT exploitable?