> Making and losing money can’t mean anything or have any emotional impact, one needs to just see numbers, statistics and trust on one’s strategy.

I've known many poker players who end up taking this to the extreme and basically think of every hour of their life in terms of their per hour expected value at the table.

Like, "Is it worth it to go to dinner with friends or should I play for those 2 hours instead?"

There are definitely happy and well adjusted poker pros as well who can shut it off at the end of the day, but that's a learned skill that doesn't come easy to many.

Maybe this is less of an issue with trading because the market has set hours?