Looks like the opposite recently
f.e. SilverCash made the move 2 years ago from $35 to $30 per signup, blaming it on new Visa regulations. But it looks like they lost some market share (?) and now they just increased the payouts to $40 per sign up.
Many other companies, like Traffic Gigolos or Perfect Gonzo also increased payouts to $40 per sale. ( cam companies pay even more but they are a different animal )
All we hear is compliants about the retention getting worse, more free content being given away for free, every surfer having pop-up blockers installed etc..... but the PPS payouts increase regardless of that....
Do you see even more programs increasing payouts in future? Or even someone beating the competition alltogether and offering permanent $45 payouts per trial? ( I'm talking about one of the biggest, most reliable companies where we can assume that they don't shave

)