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Not necessarily because everyone who plays gambling wants to find comfort in gambling so even though we have suggested the best casino site, it is not necessarily that he will get that comfort. We can only suggest many trusted and reputable sites but he still has to find what he wants and that means he has to try what we suggest to him one by one. I'm sure if he can look it up based on our suggestions, he will probably find 2 or more casinos that can give him comfort in playing gambling.
The main issues with casinos being handpicked instead of only one being used are mainly due to the coins used on them and the ease of access to the site in terms of deposit/withdrawal options and, well, access to the site itself. It's not exactly rare or odd and I doubt others haven't seen it, but there are some casinos that do not allow access to specific countries. Even with VPN, there'd still be users who wouldn't exactly like going to casinos that do not allow them. Then there's bonuses and such, which is another thing altogether.