My totally inexpert understanding is that the bookie sets the line to attract bets such that he has equal exposure for both outcomes of the event and books guar

My totally inexpert understanding is that the bookie sets the line to attract bets such that he has equal exposure for both outcomes of the event and books guaranteed profits off the vig. Also there's the occasional jackpot (for the bookie) like, for example, the Canelo vs. GGG fight that ended in a split decision. In that case they got to keep the money from all the Canelo and GGG fans and only had to pay the curmudgeons who bet the coin would come up edge. For which, if I recall correctly, the odds were about 14 to 1.