Developer tools startups definitely sound like a promising audience for this. A convincing pitch will show them that the output of your services will earn more

Developer tools startups definitely sound like a promising audience for this. A convincing pitch will show them that the output of your services will earn more than it costs to hire you. One way to do that might be if you could show some sort of survey data showing that X% of hiring managers select tools based on documentation availability/quality. Ideally, you'd come up with a way to project the impact on their conversion rates if they improved their docs in specific ways.