I would say they may have tried it more than once, which means more than 10 dollars could be spent. Plus I am sure they made a profit but looking at how the casino could get like hundreds of people trying it, then we could say they may have even profited from it. Challenges are not really in favor of gamblers most of the time, one of them will profit while every other one will lose and that is why I never really liked it.
I deal with casinos promotions or marketing or whatever we want to call that has no expectations, if they are expecting me to spend money or wager or do something that I normally wouldn't do then I end up not doing it. Just doesn't make sense to lose extra amount just for a small chance of earning more.
That is definitely a possibility, I would say that the clearest choice right now for everyone is that you should be staying away from the current betting low odd stuff if you are only doing it because you saw someone else do it and got it. I have seen a lot of people who got hyped calculating how much they could win "if only" they could do what they wish were to happen. I mean gambling is not like that, you could gamble for 99999x chance to hit, which is very low, "near" impossible and get it on the first try, or you could gamble on 1.00001x and you could still end up losing at the first try.
These are obviously not the usual results, and more often not than if you gamble at 50%, in long enough time you will have %50 wins and 50% losses, that's how it is, obviously there could be a slight change but not too much, not like 20%, maybe 48% or 52% here and there. Do not calculate what you will win like it is definite by just looking at all the other people, in the end you will be end up very sad.