The mistake most marketing agencies make is trying to serve everyone. One SEO shop got to millions in revenue by writing its playbook once, for a single trade, and running it on every client.

A drone, a license, and a laptop is the whole kit. The listing photos are a race to the bottom, but the roofs and the insurance claims are where the recurring money hides.

Every restaurant pays somebody to haul away its used fryer oil. Run right, you are the one getting paid, twice: once by the kitchen, and again by the refinery that turns it into fuel.