An interesting idea, and one I'll note seems to work.

I think the bigger issue is the trusting someone to do data-collection for ads. When everything is "pay per click" or "pay per eyeball" both sides have incentive to engage in click-fraud. All these awful networks seem to be solving that issue by creating a third party who has to attract both advertisers, and affiliates, and thus shares(at least partially) the motives of both parties