Mark_A - 2:02 pm on Jun 11, 2010 (gmt 0)
Yes, I noticed that some quite specialist three word terms seem to require more money Max CPC to get onto the first page. I am sure they were cheaper in broad match but they probably produced a lot of wasteful clicks and thus wasted money.
One ad was a problem because its key terms were too similar to another much more popular but different product. It was that one that had 74% wasteful clicks and wasted money.