I remember years back before I knew about sport betting; there was a football viewing center close to our house. The noise and jubilation that comes out from there always makes us wonder why people love football so much. Not until I realized the shout and jubilation was because people placed bet on those matches.
So, it's not like they are happy their favorite club won but because they won.

Do you get excited because your favorite club won or because your ticket won?
It is not entirely because they have managed to win money by betting of those clubs, there are people and football fans who have a very strong sense of community and passion for their clubs and they genuinely feel enthusiastic when they favorite team manage to get an important victory. That is specially true when we talk about national football clubs, those who represent not only a region of a country, but rather a whole country.
So, while it is true there are millions of people who are only into football and sports because it is a way for them to make money, the majority are in for the passion and the sense of belonging.