Hiei just barely fights back telling her that she probably shouldn't - and instead takes her trust in him with this matter as somewhat of a challenge. It isn't like he's spent a lot of time betting - he doesn't see the point nor would he have the money to put behind it considering he has no money of his own and more often than not relies on Kurama and Shiori to feed him when he isn't feeling like hunting for himself.

"Oh. That's.. easier than I thought." Worth a shot, anyway. It's free money, so it isn't like they're out anything, either. Hiei waves a hand, asking Yukina to follow him toward the slots.

"If we win anything we can get some food, maybe.."