Yeah that's why I added the ideas that there would either be a restriction of how often u can vote on things, i.e. if you vote on 2 or more predictions we'd only count the first of that 24h period
or that the wrong outcomes would get downvoted and extra rewards for the winners would instead come from the main post (prediction) rather than from the losing comments.
It could potentially be gamified to a point where people would feel safer just voting on regular content but give an option to those wanting to be a bit risky with the chance of getting 2x+ their curation rewards in return depending on the prediction and how others have voted. i.e. if it's something 90% of the people voted correctly you'd naturally only get ~1.1x your vote back, etc.