this is an old threat, but let me tell my experience with gaming affiliates group:
i got a very good offer and choosed to work with them.
– my affiliate manager is rarely responding on emails, if he responds it lasts 1-2 weeks.
he said my mails would be always in his spambox.
– they gave up representing the eurogrand casino without noticing me!
– i have an open amount (players from eurogrand casino) but my affiliate manager tells me that there would be no records and no open amount in my account.
– the gaming aff group backend is very very slow and the stats and promotion materials are very basic. there are no mailings about promotions or something. no good support.
so, never ever work with them!