I have some more great replies! And in the thread created for Roxy Affiliates, there is some great feedback!
But back to business 
SkyAffiliates
Simple answer to your question SKYaffiliates do not carry over Negative Balances, as we appreciate that a big win in one month should not wipe out the affiliates income generated from new players in subsequent months .
http://www.casinoaffiliateprograms.com/bb/skyaffiliates-negative-carry-over-rules.14545.html
Wager Profits
1) Do you carry over negative balance?
We don’t. We adjust negatives the first 5 business days of each month.2) Is the winning player removed from the account?
That’s at the affiliate discretion.3) The webmaster has to request a non negative carry over agreement?
No. It is automatically set up when you join.4) Any restriction?
No restrictions for carry over system. All affiliates work under the same no-negative carry over system.
http://www.casinoaffiliateprograms.com/bb/wager-profits-negative-carry-over-rules.14555.html