This chart gives you quick insight into a domain’s strategy and its niche dominance. There is no right answer of how a site should balance its spending, but it is powerful to understand where they direct their greatest efforts.
When the scales tip heavily toward organic clicks per day, the domain is likely not investing in a diverse high-click volume campaign in PPC. If you are going for a focused PPC approach with an aim for higher rankings, then that kind of domain might not be one for you to emulate. Look at their average ad position/# of advertisers statistic to help determine their overall approach.