This sounds like something that would go high up on our evaluation list for the company I work for -- for us, there's a big space between our bread-and-butter h

This sounds like something that would go high up on our evaluation list for the company I work for -- for us, there's a big space between our bread-and-butter high end advertisers and the remnant networks filled with advertisers that would like to make sub $5k buys but take as much or more effort than advertisers on the other side of that line. That said, a pricing model as a % of revenue would probably be less attractive than a cost based on some function of resource utilization -- we don't necessarily need to give you incentives to figure out how to max our revenue; let us worry about optimizing our pricing and maximizing sales; you focus on providing us a kickass product. Also, ideally we'd be able to traffic ads sold via self-serve into our existing inventory (i.e., not a separate unit or zone) AND avoid overselling impressions we don't have (e.g., we frequently "sell out" of certain geotargeted metro areas) -- so it'd probably be best if it worked in tandem with our ad serving software (currently Google Ad Manager/DFP).