Please a-ads ,reply to this question , i have 10 blogs(pages) , what is better for me as publisher , create 2 ad units and put them into every each of them ( 2 ad units for 10 pages ) or ....  create 2 ad units per page , so that would be 20 ad units , 2 ad units per page , what is better ? how would i earn more ,i think the second option its better , what do you suggetst better ?