Bookies do not care who wins. They win either way. The line is set so
money is evenly bet between the two teams. You should have paid attention
in school.
That is pretty much how insurance companies work too but that is also
a bet.
Insurance companies lose once in a while, but that just allows them to up
the bets, oops premiums, which injures they make even more money. Which
Democrat made most of his billions off insurance company money? Actually a
couple of billionaire Democrats make billions from insurance companies.