Delaware residents and visitor must be in the state to gamble in state operated online casinos because these gambling sites are only available within the states borders. Most Trusted US Friendly Site. Many are hopeful that this will eelaware to an online poker interstate gaming compact between the two states.el derado casino HOW ARE SLOT MACHINES SET TO PAY OUT Nevada Online Gambling And Legal Gambling Options. However, the slots player in Delaware will see little functional difference. They still pay out in cash, and they still offer the same relative level of payout percentage – between 87 and 95 percent by law. Is Online Poker / Gambling Legal in Delaware? Almost without exception, poker players in Delaware are a frustrated lot. The state of Delaware ’s poker laws ban most forms of gambling, including poker and other card games. Delaware is a gambler -friendly state, in which its residents have been gambling online for at legal gambling sites for years. When the legalized online gambling sites are finally open in Delaware, they will only be available to Delaware citizens.