That's a good thought but zero commision doesnt really change the investment attitude that much apart from the fact that it makes very low value plays possible. There are tons of people having the same speculative investment behaviour on both sides of the line especially on larger bets. It's the smaller bets that Robinhood makes possible. I would also argue that Robinhood is a great playground to learn trading at minimal cost. I have tons of freinds with 500 dollar portfolios playing around and learning the ropes. This was seldom attractive with web based serious accounts. In the end it's all about discipline and eventually Robinhood users reach the same investment mindset as regular account players very soon.