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Apr 2004 : X clicks = Y dollars
Oct 2004 : X * 1.7 clicks = Y * 0.9 dollars
I did not pick the worst months, this is a trend that is slowly but surely declining. In a world where the # of unique visitors to your site has a direct bearing on the bottom line, this means we are working nearly twice as hard to get the same results.
I hope this is an isolated case, but I fear not. If you care to compare, pls post your relative ratios, thanks..
BTW, I have not implemented multiple ad units.