«Revshare from 50%» is clear right up until the first report, when it turns out the percentage comes off something other than you assumed.
What the percentage comes from
Not from the player's deposits but from what the operator earned on them — the difference between what went in and what was taken out. A player who deposits a lot and wins it back brings an affiliate roughly nothing.
Hence the defining feature of revshare: income depends not only on you but on players' luck. One large win can absorb a month.
Negative balance
If players won more than they lost over a period, the affiliate's share goes negative. What happens next depends on the terms: the minus is either zeroed at month end or carried forward. This is a first-order question, to be asked before you start rather than at the end of month one.
Why income swings
Because it is computed on play, not on acquisition. A steady flow of new players produces unsteady income — a property of the model, not a sign that you are being short-changed.
Telling normal swings from an actual undercount takes your own statistics — how to keep them.
When revshare pays off
Over months, with a returning audience. The horizon calculation is in player lifetime value, and the model choice in CPA or revshare.
18+. Bringing people into gambling means working with other people's money and other people's risk; no advertisement or message may promise a win.