~snip~
Well, I
have searched for that, and found no results. That is because it's pointless to pay big money for buying a source code, not knowing whether it will be profitable, when you can just rent the thing, and see what happens. Besides, I doubt that any major online slot providing company will
sell their source code, in the first place.
I think the casino will not want to say whether they are buying a source code or rent from the other gambling provider because I believe that will be their secret, and they don't want the public to know one of their secrets. Besides that, I think they will not tell us how much money they use for the source code, and they perhaps only tell that they spend some money to rent the code. At least, they need to keep one of the secrets for their business because they don't want their competitor to know about that secret.