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/Peo, FreeWebSpace.net
Generaly, smaller sites use CPC to their advantage and larger sites use CPM to thier advantage (targeted ads mean more $$$, and it's a 'stable' income, if there is such a thing on the net ).
You're right John, but most CPM agencies don't want you to put the ad at the bottom. While you would make more money this way, you would probably get your account at least suspended and wouldn't get paid most of the money you made.