Games have nothing tangible to offer other than the satisfaction of gameplay.

So games "reward" system is infact more gameplay.

The real question of what this tweet is asking if why do gamers try hard in some cases but not in others? Because tolerance. Fiction has suspension of disbelief,. Game difficulty has level of tolerance.

Like suspension of disbelief difficulty tolerance is reliant on the persons ability to tolerate what's being presented. Which is why some fiction is extreme fantasy settings retain suspension of disbelief while realistic fiction settings may be hard to suspend disbelief. Game difficulty tolerance requires you to at some level enjoy what you're doing and understand what you're doing. Some game may have lower tolerance just because of circumstances related to what you're playing. More people may be willing to go though dark souls difficulty just because it is dark souls and known for being difficult
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@zemichi More importantly, it's potential. You give someone a puzzle, they can move the piece three ways and they need to figure out which one wins, and none of them do. They'll give it 4 tries; on the 4th they'll look for some secret way of moving the piece somewhere else, then they'll give up.
But if they see a lot of different things they could do better, they'll try.