How Do You Use Amazon PPC to Scale Your Business?

Pareto's principle is that 20% of what you're doing on a daily basis produces 80% of your results. So if you have 10 products, two of them are producing 80% of the revenue. If you have 1,000 SKUs, 200 are making the majority of your business. How do you use Amazon PPC to scale your business? I know it's one of the most important things really,. so how do you use use it to scale?