Why would most people always imagine that gambling with multiple accounts on some crazy scheme would make them richer? I mean do they really think that having just one account is the thing that keeps them from profiting? If people were allowed 100+ accounts they could have made a profit but since we are only bound to having one account only we are losing money? That has never been the reason why we have lost money, and it will never be.
The reason why we lose money is the fact that we do not have the edge, casino has the house edge on their side and that is why they make the most money, that has always been the reason why they make the most money. Hence why I believe it is vital to us all to realize if we create more accounts, it will be against the rules and dangerous while giving us no advantage at all neither.
I don't know for sure about this but have heard of something like that, it could be why they say creating a new account will make the possibility of winning more because they have experienced it but it's actually just a coincidence.
Regarding casinos that make more money, it is certain because this is a business and that is the goal of the casino business to get profit.