I do not see any good reason for them blocking multiple accounts in casino gambling by the casino platform because it has no negative effect to the platform. As long as those accounts do not go against the rules of the casino platform. They need more users and that is also part of getting new users into the system. The reason for banning multiple account in the Casino platform should be that they either violate the platform rules or cheat other users int he platform.
Majority of people that creates multiple account in a casino are doing it to cheat the system and not because they are hoping on getting a different experience from the account. Some of them create it to cheat in tournaments and also to abuse several NDBs - we have seen several cases of accounts being created so that they could get bonus and then tip their main account and they continue doing it till their account gets the minimum withdrawal amount.
I remember when I created a double account at bcgame to test out the self exclusion system and then got reminded by a user here in Bitcointalk that I should let them know about my other account and have them disable it to prevent future problems with the site.
And those people do really believe that they could milk out the casino but without knowing or they do make just make themselves being caught and locked up their funds. They would easily be detect out by the system
if ever they would really be tending out to cheat. We do know that these platforms are really that serious when it comes to security and if there would really be some breaches then it would be detected right away
and if its missed then that would really be their own deligence about on setting much better security measures but in speaking about multi accounts and other abuses then it would be something that easy to be
caught. Usually on the sites that im playing then they are really that allowing multi-accounts on which its good yet there are really people who do make new accounts specially on the time that they do feel out that they arent lucky on the current one or simply they had forgotten their account details and make another new one. Just like been said by others that as long you arent doing something stupid then i dont really see any issues with this but if you are making some accounts for the sake of abusing something then get prepared into those accounts to be blocked.