> Huge expected value can also make people fools, without a scrap of real hope of future returns.

See also, Gambler's Ruin.

https://en.wikipedia.org/wiki/Gambler%27s_ruin

That's only an issue if you are making bets such that a large loss will make you go bust. If you are facing that possibility, then you need to move down a level. If you can continue to make bets at your level, then the +EV will increase your roll over time.

Poker lessons.