Sports betting. It's simply because this is only type of gambling which I'm playing. Sometimes I bet few bucks when odds are very high. Few bucks isn't much to lose, but sometimes I can get really big reward if I win. I'm not playing dice, roulette, blackjack and other games just because I know that I will just waste my money on these games.
I partially agree with you because sports betting allows you to multiply bets depending on the odds calculated by the number of people betting. It's different than games like dice where you lower your chances of a positive roll and increase the payout. Dice odds increase your chances of winning big proportionally but sports bets can be biased and not represent the real state of the odds.