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it's strange that it's that cheap, especially since the OP didn't provide a DEMO for everyone to see and test how the casino works to make it easier, besides why didn't he just build it himself why should he sell it that cheap, even though it could be profitable for him and become a money machine for him, but I'm not sure the OP sells casinos that cheap it could be just another scam
moreover, I think that code should be available for a check/audit since it can have some backdoors/exploits that could drain user funds or have some bugs on their game. of course seller should provide all information for any kind of deal.
a product like this should have a website and not newbie that is advertising on a forum/discord channel...
i have no intention of interrupting the OP's business but i 100% agree with what you are suggesting that potential buyers should check the code of the site carefully to avoid any back doors that could be hacked because the gambling business is all about a good reputation. the price offered is usually in accordance with the quality of the product on offer.