fclark - 11:28 pm on Dec 29, 2004 (gmt 0)

it's because it is profitable to do so

I've run quite a few ppc campaigns while testing new merchants, copy, keywords that turned out to be unprofitable.

It's possible that unprofitable campaigns persist on meaningless keywords, particularly with ebay, while new affs replace those who are placed on hold.

</devil's advocate>