Thanks for this info. I own a business, but I never really knew the 80/20 rule, yet when I read this it all made perfect sense when I applied it to my own businesses. It is a bit of a mind game too, when you post and put your heart into what you're doing, knowing it's good quality content, and somedays you're lucky to get more than $1!
But keep on keepin' on is the name of the game! :)