I am a newbie but I think it is normal (as far as you trust your affiliate program!). As Dominique mentioned, it is totally random. You never know how will you finish this month- in the red, or with a nice paycheque.
A couple of days ago my few existing clients were winning, and my balance was – $3,500. I even contacted my affiliate manager inquiring about three suspicious winnings in a row by one of my players.
Today, I am back into the positive territory after some players lost big. A couple of them are extremely active, playing practically every day (slots and table games). Within the last month each of them lost over $3,000!
So it is pure luck. Who knows, maybe tomorrow I will be in the red again? At least, I have prepared myself for that.