We've seen many casinos got fail because sell both together, something must be sacrificed between them. but, as I know, several casinos do it together with success, like giving free the token for purposes try the casino, but of course, they will make dump a price but besides that, the casino will be crowded. If can't do that, choose one.
Those casino failed with this kind of feature are those who has insufficient funds to continue the operation with minimal profit. This is the reason why big casino company don’t want token because they are backed already by private investors and having there token will just make there business more complicated because they need to reward those token holders in exchange for there investment in tokens.
Only few casino manage to survive on this business and some of them choose to exit after getting funds on initial token sale rather than continuing the casino with fixed monthly expenses without assurance that they will get more customers.