Maryland casino revenue climbed nearly 10 percent in May , with the bulk of gaming coming from Maryland Live Casino. The state’s four casinos brought in $75.8 million during the month, up $6.6 million from $69.2 million in May 2012. Maryland Live, the state’s largest casino, generated $59.5 million, up 8.1 percent from $4.5 million a year before. The casino operates 4,204 slot machines and 189 table games. Hollywood Casino Perryville’s revenue dropped 8.7 percent, or $748,272, to $7.8 million in May. The casino operates 1,158 slot machines and 22 table games. Casino at Ocean Downs brought in $4.7 million,…