You need to meet one of these fair play rules so people wouldn't just make many accounts and join this with all of them.
These are the fairplay rules, you must fit one of thme if you want to join this. You can read more from the first post.
1) 20+ Bitcointalk activity & Primedice account older than 1 year
2) 50+ Bitcointalk activity & Primedice account older than 6 months
3) 100+ Bitcointalk activity & Primedice account older than 3 months
4) 200+ Bitcointalk activity & Primedice account older than 2 months
5) 300+ Bitcointalk activity & Primedice account older than 1 month
6) 400+ Bircointalk activity & Primedice account older than 1 week
7) 500+ Bitcointalk activity & Primedice account older than 1 day
8 ) 20+ Bitcointalk activity & over 100 BTC wagered
9) 100+ Bitcointalk activity & over 50 BTC wagered
10) 300+ Bitcointalk activity & over 25 BTC wagered
11) Primedice account older than 1 month with over 100 BTC wagered
12) Primedice account older than 2 months with over 75 BTC wagered
13) Primedice account older than 3 months with over 50 BTC wagered
14) Primedice account older than 6 months with over 25 BTC wagered
15) Simply 200+ BTC wagered