Hi there!
As you probably already know, split testing between different CPA Networks can be essential. However, what would you do if you decided for Network B but the Affiliate Managers from Network A and C want you to send traffic at their network? I mean, when you applicate to the network you make the appearance as you are very interested into running an offer at their network etc.
Me, for example, applied at YeahMobi, MundoMedia and will eventually get a reactivation of my inactive account at ClickDealer. I just had an interview call today with YeahMobi and got accepted. I'll get in 2h another interview call with MundoMedia. Almost every interviews are the same (Asking for traffic source etc.). How should I react if I'm sending after a split test only to Network B. If the Affiliate Managers of Network A and C ask why I stopped sending traffic, should I simply say that Network B is simply performing best?
Thanks!
Don't worry about that mate, it's their job to ask you for traffic, it's your to tell them that you did give the offer a shot but you're getting better EPC elsewhere (they'll understand, it's the name of the game) but that they should keep you in the know should a similar offer appear 
Learning how to say no is essential to your earnings, and your focus.
Mehdi
Can't make everyone happy.
They're trying to get you to run traffic so they can make money. They'll understand when you can't, but theyll still try!
Just make sure you do make an effort if they consistently are. Only fair.