I have no idea how much a big affiliate marketer earns but I hope you don't mind if I ask how much you usually make with that amount (BTC13.77) from your referrals in another partner casino. I just want to compare.
This is unrelated to your case but it could still be relevant - there was marketer/member who complained about their referrals reduced by Betfury. They deleted accounts that signed up through their ref link for suspicions of bot (IIRC). I think it was later resolved with the complainant winning and I'm not sure if he/she got additional reimbursements.
Quote from: https://medium.com/@BTCGOSU/btcgosu-ends-partnership-with-betfury-with-immediate-effect-e33df658c713
When we thought it couldn’t get any more unprofessional, BetFury came along and reduced our previously “improved” affiliate deal — yes, what a joke, considering the numbers above — on the grounds that we no longer promote them.
Was there a prior stipulation that they can do this if the program is terminated?This is unrelated to your case but it could still be relevant - there was marketer/member who complained about their referrals reduced by Betfury. They deleted accounts that signed up through their ref link for suspicions of bot (IIRC). I think it was later resolved with the complainant winning and I'm not sure if he/she got additional reimbursements.
The very minimum would be ~1.4 BTC - literally talking about the absolute minimum, this would be very far from a good deal (industry average).
They can do whatever they want and I am actually not saying that we have been scammed per sé - even though one could argue this is not very far off. You know the thing is, the traffic that we sent them for free, in exchange for the affiliate deal, is still there and will keep on playing on their site - for that reason, retroactively changing deals is a big no-go - shouldn`t it be an even bigger no-go looking at the figures and the fact they are paying 1/10 of what would be the minimum in this industry?
Go figure - they rather not negotiate a fair deal for both parties and prefer to keep the existing players even though we could have obviously sent them another 400k USD in deposits... says it all, doesn`t it.
Who in his right mind would take such a business decision? 
Ultimately, I will not stop trying to help bring the industry I am working in to a better level, trying to be as transparent as possible while doing so.