Do you have bus and add rates for 2006? I think it's going to be much lower. If not I think you've got to work the the 2007 to 2009 data.
Direct sales will go up with the number of buses, doubled between 2007 and 2009, and the increase of the add call charge from $13 to $21 (or whatever) and the Embedded adverts which they can throw into the mix.
So, simply, the more revenue up for grabs the more a sales person can bring home. As you say their growth has lagged the Ad revenue growth.
So, take the $26M in 2007 and double it for the bus numbers and increase by 76% (21/13) for the rate increase and you have $92M.
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