There may be many people who just make gambling for fun, I'm sure they only play in small amount.
They play with a small amount and hope to get the jackpot. I have seen some guy that have high bankroll and he prefer to play with a small amount in sportsbook. He tend to parlay in alot of games and go for a high odds instead of just going with favourites in a single bet , he won some of the game and ended up in profit thus gaining himself some fun as well
My reason gamble just for fun. if i lose not anything. if i win, passable. because, if we pursue profit let alone without a goal. then certainly lose.