Even the bookies can get in trouble as the spread changes during the week. By the time they start laying off their bets, they might fall into the crack and owe both sides.
Let's say Giants vs Cowboys and Cowboys are favored by 6.5
during the week, people bet $200K on the Cowboys and $100K on the Giants. Bookie realizes this and wants to lay off $100K of the Cowboys action on Saturday. Now the spread is Cowboys by 7.5. He lays off $100K of Cowboys at 7.5
Cowboys win by seven. He owes his customers $100K because they got in at 6.5 and he owes the layoff bookie $110K because he layed the bet off at 7.5. In that case, he would have probably kept the bet himself and lost $90K that week on the game.
You would move the line accordingly , as the bets poured in on Dallas you would move the line and or up the juice on Dallas. So instead of laying -110 you have to lay -120 to win A 100 on Dallas -7. You make Giants -105 +7 to try to incite action on them .
