While we can’t speak for Mummy’s Gold, the promo benefits affiliates in the way that players get a chance to win a rather large prize. This makes the users stay longer on the site and see some big prizes.
With our linking code you can always turn the pop off by adding the &pop_up=0 on the end of the linking code if you feel you don’t like the promo.
EG
xxhttp://www.goldentigercasino.com/referral.asp?aff_id=affXXXXX&pop_up=0
Users are also able to unsubscribe from _any_ casino mailing list at _any_ time. We have a very strict email policy and don’t condone spam from any affiliates nor from ourselves. Users are given every chance to unsubscribe for anything we do.
As for the credit/linking to affiliates, our system always works with the player getting credited/linked to the last affiliate tag they clicked on. So in this case they will be credited to the affiliate that sent them to the casino for that casino. If another affiliate sent them to another of our brands then that affiliate will get credit for that casino and so on.
I hope this helps. If there are any further questions please don’t hesitate to ask 
Cheers