This is Jonathan from Kontera.
Relache is correct, a very long time that was true but currently no matter what you earn, it rolls over until you reach the $50 minimum payout threshold.
If you've been a publisher for more than three months, you can manually change your payout minimum from $100 to $50 by visiting the Payout Method page in your Publisher Center (we changed the minimum threshold recently.
Regarding, Pcunix, I totally respect your opinion, as you mention that some people find all types of advertising annoying. But I can say, that because Kontera ads only appear after the user scrolls over them with their mouse, they're only displayed to people actively interested in seeing them, and most people find Kontera to be a much less intrusive form of advertising.
- Jonathan Cohen
Kontera Community Manager