1. What 5%?

2. You don't need my service, don't post.

3. Referring yourself is against the site policy. You will get simply banned with your coins in or out of it. If you have been paying attention to this forum, you must have seen casinos (win88 is the most recent one) banning users for doing that. Most will not be public. And sites usually have a zero tolerance policy in such issues since such behavior will reduce their profits.
There are multiple ways (like bitcoin addresses) other than the ip that they check to confirm it.
VPNs: Unless you are sure that no one else have created an account with it, it is the same result.