I'm late in responding because I don't have much for you. I do know if a person in my County had a certification, he or she wouldn't get paid any more than anyone else by a retailer. A buck is a buck and most work is come by through retailers.
I have no idea the cost or time it takes to become certified. Have you done much floor covering work or plan this as your full time trade?
I run a home repair and handyman service out of North Denver.
I am getting involved in a refinishing & maintenance startup. The startup is to be IICRC certified flooring service called Restore Denver.
I started with another person who is certified but he might be flaking. He claimed to have several contracts in the works but I don't think they worked out. I don't know much about floor refinishing, but have installed a lot of luxury vinyl tile flooring.
I was thinking of taking the certification program but it has like 25 areas of stuff! If the certification doesn't pay or give an edge it has no value. I thought that maybe they had some weight that gave a company a plus.