There are a lot of players around the world. Not every games are favorite in all region. Some likes soccer, some maybe esports or some cricket or others.
Which one are you mostly placing your bets on? Besides, do you think gambler don't care which sport it is. I have seen gambler who don't have any fucking idea about cricket but he used to bet on cricket.
Well, that depends on person whether he likes sports more than betting or he likes betting more than the sports.
However, when you place a bet on a specific sport, It is too stupid to just bet without even a single idea about. I mean that doesn't make any sense lol, he could've gone to a casino and place a bet where theres a dice roll. That way profit and losses are quickly achieved.