To be clear, I was role playing an efficient market fundamentalist. Or trying to. And (trying to steelman the argument) was careful to not specify which group

To be clear, I was role playing an efficient market fundamentalist. Or trying to. And (trying to steelman the argument) was careful to not specify which group of people were making the bad decisions. It is obvious that at least one side of any pure monetization trade like this are making a bad decision (and it could be both; for some such games the only winning move is to refuse to play). So I certainly wasn't claiming that people couldn't make decisions this bad since (as you note) this is clearly counterfactual. My point is that we're seeing an intersection of "you can't cheat an honest man" and "there's a sucker born every minute," with a touch of "we cheart the other guy and pass the savings on to you"; _everyone_ involves thinks they are making a smart move, and in a case like this at least half of them must be wrong.