It is not impossible to happen that a profitable casino website will be up in the market by the owner to sell it. Although, even with initial impression and common sense, one would ask why the owner would want to sell something like that. As per the OP, change of plans and priorities had become the main reason. Some will be convinced and intrigued, but some wont buy such sentiments. Regardless, if someone dares to think of buying such, second thoughts must happen for the purpose of clearing out every possible risk and questionable angle in such intuition. After all, the amount being asked is thought as impartial to the value that the website would be giving back to the buyer, at least for a long time.
it is possible that the owner of a profitable casino site wants to sell it with the aim of making quick and instant money, even though selling the site makes no sense and there are not necessarily any buyers.
after all, at this time more and more people will do rather strange things to be able to make money quickly, although there are also those who make fun of it and don't believe they still don't care.
It is perfectly possible, because some people are serial entrepreneurs and create business after business and then sell to others that are specialised in making the company or the site grow to full size and implement a more mature business model. It is said that there are many reasons for selling, but only one for buying.
But regardless, it is quite a challenge to verify the claim of profitability without investing serious time and effort into it.