some people just don't care as much about the accuracy of their predictions on GJP

Agreed. Insofar as GJP is a contest, and the objective is to win, my remarks should be read with the implied proviso "assuming you care about winning". In the prelude to the post where I discuss my GJP participation in more detail I used an analogy with playing Poker. I acknowledge that some people play Poker for the thrill of the game, and don't actually mind losing their money - and there are variable levels of motivation all the way up to dedicated players.