Why has betting become a symbol of sports games? This is not true.
I think this is so because sports is what comes almost every time, daily and season unlike election that comes once in a while and people need something of attraction that will take them away from boredom. Again sports has been associated with gambling and what we are seeing now with betting on election or election date is just a new kind of betting style that is emerging.
We can argue about any event - political, musical, economic, even esoteric.
Sure because betting is about chosing of the final outcome of something that you involve money with it as a benefit for being right and when you are wrong, you lose your money. So to bet outside sports or casino games is also part of betting. If you say a particular musician is going to win the grammy or whatever musical competition on a particular category and someone disagree on your position then you involve money into it, you are already betting on it. Therefore, betting these days is not only about sports but it is now including other parts of human services and endeavors.