Maybe he really feels down, but if he can bet a huge amount of money like that, I'm sure this one is multi millionaire or even a billionaire, and that amount of money is just a piece of cake. I think he's more down because of the fact that his beloved president lose compared to the money he lose. I think he's one of those people who believes that the election is rigged. As we can see, he's bet was on the 50-50 side, we all know trump has a lot of followers and he's more on the safe side before betting, but just like what every other people say, voters who decided to have a change in their country will be unpredictable. I hope no dirty works in this election, I wanted to believe that a lot of people really voted this time.
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, in fact this is no different than what I have seen many times in physical casinos years ago, in which a person lost a great deal of money to the casino and as soon as he got his pay instead of buying his basic necessities he went to the casino to try to recover some of the money he had lost there.