How would it be so obvious to you that what is clamoured to be true is not true and you still dared to bet so heavily just to prove them wrong?
Such a case should be staked with a little amount and then when the games fails to play accordingly, you would stand a safer side not to have any to regret out of and if it plays too, you don't have to feel greed with regrets that you would had staked heavily for bigger profits.
I gambling, you don't have to stake beyond your affordability just to impress the audience. You would lost your funds, go home and struggle with the emotional out breaks while the people mocks you for the lost.
Sometimes we want to try and show who is right, that feeling will come up and you try to prove yourself to others, and it's natural for people who like to gamble in my opinion.
Was the huge stake really necessary on such scenario? I guess not because as an experienced gambler, accepting such bet challenge should not get your mind lost that gambling is a game of luck and only what is affordable is advised to stake on it but though it only fees cool if the huge amount staked by the guy was nothing to be compared to his income or savings if it get lost.
Maybe the amount only feels huge for the OP and not the bettor. Lol