Gambling looks like an entertainment because it is usually attached to a sport or game, but since it involves losing or gaining, it is no more entertaining to the losing side, it is more of a business in such way become only few and quite rich gambler just do it for the fun of it, as in to arouse the opponents seriousness to the game. Most people generally, gamble to make gain.
it is true while you we're watching sports and the same time you bet on the side you want to win and it becomes entertainment also if you are playing with multiple player than playing solo we it's kinda boring and yet of course if you keep losing emotion will come and the more eagerness to play more because we all want to get back what we already lose. But if it okay to us to win the it is really fun to lose money as long as it make us happy.