My buddy runs his own drywall business and meets a lot of people who need work. Occasionally he needs an extra hand on a weekend job and calls me up.
This time it was tearing up the back patio of a customers house and hauling it away. My buddy has a small tractor, and we bashed the shit out the concrete, and hauled it all away.
We spent 8hrs on the job. My buddy hires out his tractor/operator at $100/hr. He charges $25/hr cash for my help. My friend is super thrifty just like me. He's working these weekend gigs to pay for the tractor he bought to develop a piece of land he recently bought. He earned $800 for the day, and I earned $200. It seems lopsided until you think about the near $50k in equipment we used to get the job done ($15k truck, $7k dual axle dump trailer, and $27k tractor). I have no overhead, he's got plenty.
I make more than $25/hr at my full time job, by a large margin, but an extra $200 goes straight into my investment account each full day that I work for my buddy. I'll take it any free day that I have.
Probably going to have another weekend day in the future to finish the job we started. Boom.