We do not know about that, while it will be irrational for a person to bet every single dollar he has on his life on a single bet we know that humans are not rational all the time and can be very irrational, so it is entirely possible he put all his money on this bet hoping that he will multiply it in a single night
If anyone is having the audacity to make a bet that would destroy his entire wealth like that then he is in for a real awakening and the amount of time he might need to spend to accumulate the lost wealth will be a hard task and that could destroy his life forever.
The person behind the bet will be praying that once the votes are recounted Trump wins

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Imagine the pain and stress that person would have to bear and there are high chances for people getting heart attack or something else when hearing they have lost it and now it may again take years to build that provided they can still make that much money of wealth unless you are already rich then no worries at all. But those who have almost taken a bet of their wealth would have a huge difficulty in coming times.