Ok but what I don't get: where do they get money to speculate on financial instruments? I didn't care about the stock market when I was in high school and college not because it wasn't cool, but because I had no discretionary cash.
A brilliant thing about the current state of cryptocurrency markets is that you can buy $10 at a time and the fees are a fixed small percent rather than e.g. a flat $5. GDAX has 0.25% market orders and 0% on limit orders. Trading small amounts on the traditional stock market is between impossible and pointless.
I don't remember transaction fees being the issue...