>>11492657In sports betting, you can make money if your guesses are better than the other player's. You don't necessarily bet on the horse you think is fastest, but on the horse about whose speed people are the wrongest.
In poker, too, the way to make money is if someone at the table is a sucker. So I expect that beyond being good at poker, you want to be good at recognizing suckers, and ideally you want them to not realize that they are the sucker until they're broke. Therefore, it's probably easy to end up the sucker and not know it if you don't pay attention.
Another place with the same dynamic is the stock market. There's a lot of suckers, but also the most professional sucker chasers out there. (And also people for which trading stocks/options is objectively useful, such as farmers buying gurantees that they can sell off their grain, or taxi drivers buying shares in Uber, so if they lose their job, at least they'll be rich.) Many areas of expertise can be turned into some measure of market advantage. (Think of fees and taxes as the house edge.)
