Appropriate commission % for marketing websites and related apps
A web development company is offering me commission-only work for marketing their products (commercial websites and related applications, I reckon mostly for the food industry). I've been writing ads for family and friends with great success most of the times, sometimes charging sometimes for free. How much do you reckon is a fair percentage for this kind of work? Would it also depend on the industry (other than food, etc)?
Thanks guys
"Opportunity is missed by most people because it is dressed in overalls and looks like work." Thomas Edison