Besides the reward of a more capable brain, the reduced effects/risks of dementia, the contrarian need to argue, the altruistic desire to help neighbors with difficult problems, the selfish urge to daydream... yeah, there are people for whom none of those are motivating factors.

> But that in itself also isn't compelling to lots of people, why should they care about "exercising your brain"

I just sort of assume people don't want to be stupid and ignorant, but maybe I'm wrong