How come having two or more account help to win more ? More accounts = more to deposit = more to lose, when chance to win is the same for every gambler. I can only understand if the situation was about users trying to cheat with welcome bonuses if there were any. But correct me if I am wrong, nobody now gives free bets or free spins just for a registration. I could understand if a person creates another account, because his first was banned, but it is a risky move, because chances for second account to be banned are increased. I can accept that someone create multiple accounts because he wants to get low level up bonuses, because wagering several thousands is always easy than, for example, wager from 50k to 100k to get free 10$. But that is also illogical. While trying to get $10, it easy to lose much more.
As @ultrloa, @Adbitco, and @Hirose UK said, having multiple accounts can benefit gamblers especially in referral. They can get more amount as the reward if they use all of their account in different time. But casino will know and will investigate it furthermore to proves that they are not cheat the casino. They will use one account and playing gambling and they don't mind to deposit more money because they have a reason why they use multiple accounts. We never know what is their reason because those people will not telling clearly the goals. For us, that will not make sense but for them, that still make sense especially if they are often doing that in the other casinos. We just don't know how and what they will do.
You know most casinos or betting site highly frown that and if they noticed that one IP is tied to multiple accounts they would dig to suspend your winnings and or would freeze the account because an investigation was carried and the account was originally created by one person at this point they would term it to be cheating with multiple accounts, main while where you were making deposit your account wasn't tied to any multiple accounts because there is a winning which they wouldn't afford to lose from there side and will search everything possible to make sure there is an error and to corrupt your winnings.