How well do professional graffiti artists get paid compared to other jobs?

My friend and I have been painting (not really professionally) for like 3 or 4 years and we just finished a commissioned painting in a child's room. They bought the paint which was $160 worth of paint, and they paid us $350 just for the labor.

Pro graffiti artists get paid $1000 and up because they do huge murals. Check out TATS CRU and Graffiti Life Company they are professional graffiti artists for hire. See links below in the related links section.

---- Many Graffiti Artist's destroy for fun.

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The Kwota Crew do some nice work. I get paid just to do sketches for people and I think that people who make the name can do it professionally...