If you're betting on collapse, and you are right, you aren't going to be around to collect.
If you're betting against collapse, and you are wrong, you aren't going to be around to pay up.
If you're betting against collapse, and you are wrong, you aren't going to be around to pay up.
If you're betting on collapse, and you are wrong, you will be around to pay up
If you bet against collapse, and you are right, you will be around to collect
It should also be said that with prediction markets, you don't have to wait until the event happens before selling your position.