>>526092Yeah, there's even a term for it: the juice.
If you're betting on coins against a friend, for example, with a $1 bet each, the winner getting 2x their original stake. However, if the house offers lines about this exact same event of coin-flipping, they would not be with 2x multipliers, but 1.6~1.8x multipliers for the winner. This means that (obviously, the loser IS straight up fucked), but even the winner is robbed 0.2-0.4% of his. That theft IS the guaranteed profit for the house.