@Rollbit Razer, quite glad that you could reply here, It would have been nice to see how you can detect abusers but I'm sure it would pose a risk to your process of how you catch them.
They can easily do that because they can trace the location of the IP and the devices their payers are doing, when two accounts are using the same information it will have an alarm for that account, of course, they cannot do screenshots to post here, but if OP wants it they can ask a trusted third party to do that Betcoin.ag has done that by undergoing this party mediation through askgamblers, its up to OP if he wants to pursue this.