Sportsbook

Major sporting events that do not follow a specific schedule, like boxing, can create peaks of activity for the sportsbooks.

The sportsbooks had to pay a 10 percent tax so they charged a high vigorish to gamblers, but they still brought enough business to make a profit.

Some casinos use third-party operators for their sportsbooks, such as Cantor Gaming, Leroy's, Lucky's, and Club Cal Neva.

In 2011, British bookmaker William Hill agreed to buy the Leroy's, the Lucky's, and the Cal Neva chains, which would give it control of 115 of the state's 183 books.

The most profitable Super Bowl was in 2005, when the Philadelphia Eagles covered the spread against the favored New England Patriots, earning the books $15.4 million.

[4] That year, the NFL, MLB, NHL, NBA, and NCAA filed a lawsuit against the state of Delaware, claiming their sports books were violating federal law.