it can be as simple as, the messiness of figuring out what to do is completely taken care of - I'll deliver you the recommendations next week.

Not really.

It could be that "I would orient my marketing efforts to get you 1000 leads in 2 months. If I hit the target, i get x amount, else y based on the final result. You dont need the percentages. The key is to position yourself in a manner that whoever is hiring you can depend on you for results regardless of the circumstances. This way you get more recommendations, and better pay.