No - you always place predictions against other users. So every prediction must find a counterpart. If no one is willing to take the other side, you will get your stake back without any deductions.
Fairlay are really just facilitating p2p betting... you say "Hey, I think that the ETF will go through with odds of $1.50, anyone want to bet against me?"... and someone who thinks that it won't and likes the $1.50 odds can then bet against you.
So, while you're free to offer whatever odds you like, it requires someone willing to take the other side... so if you make it too ridiculous in your favour, it isn't likely to happen and you'll just wind up getting your money back.