I always try to put my feet into the affiliates shoes first.
1. A successful affiliate re invests into their business to have long term income.
2. Players will win and lose – player volume is key so one win will effect an affiliate that has low volume of players. If you have a high number of players and the casino helps retain players 1 big win is not a big hit.
That is why it is so important to always grow your business.
On the operator side:
1.Communication is key, a partnership is the only way to succeed.
2. A casino has operating costs and retention costs they also have people to pay to keep the operations running at peak efficiency.
So in the end an operator and an affiliate are in it together and need each other to succeed. An abuse from either side is a lose lose scenario.
Both sides need to share the wins and the losses per month – if it’s one sided nether side can move forward and offer the best service to the player 
I would like to know from affiliates – is negative carry over ever justified? if so what are the reasons?