Red Hot Revenue has removed the CPA program from their affiliate program effective September 2008.  The following is extracted from their new Terms and Conditions which have removed the old CPA verbage and replaced with the following:

PAYMENT OPTIONS UPDATED – NONTERMS UPDATE

Due to the difficulty in ensuring that affiliates meet their responsibilities with respect to the CPA conditions this program will no longer be offer to new affiliates as of the 1st September 2008. Any affiliate who established CPA programs prior to this date will be reviewed accordingly and notified by email of any change to their earnings structure. As we understand that there are legitimate affiliates who prefer the CPA model we will on a case by case basis review CPA applications. (Please note that Red Hot Revenue reserves the right to withhold payment for CPA deals for 60 days to review traffic and chargeback rates)

Summary: This is no surprise.  CPA is a losing deal in most cases for both affiliate programs and affiliates alike.