europeforvisitors - 3:19 pm on Mar 21, 2007 (gmt 0)

The CPA model is tilted in the advertiser's favor, so there's really no reward for the additional work required of the publisher.

On the contrary: The rewards can be much greater with CPA than with CPC, if the publisher has traffic that converts. The real question isn't whether CPA works; it's whether there's a benefit to working through a network like Google or Commission Junction instead of dealing directly with the affiliate partners.