Members of the eBay Affiliate Network team have authored an interesting white paper, The Coming Evolution in Affiliate Marketing: A Focus on Quality for the Search Engine Marketing Journal.
The white paper discusses insights the eBay Partner Network has gotten from performance data analysis that suggests that advertisers may be able to improve
ROI and performance by evolving their affiliate programs to better calculate and compensate for the value delivered by their affiliates.
In plain terms, affiliate programs should focus on quality over quantity.
Read the white paper at http://www.semj.org/documents/SEMJ_ebay_vol2.pdf.