Last summer I had a client hand me a stack of "premium" cedar boards that looked like they'd been used as a diving board, and I spent a good hour just sorting the junk from the usable stuff. That's the part the Portland guy is glossing over. Free labor sounds noble until you're the one eating the time. My fix is I don't call it a markup, I put a line on the bid that says "material handling and sorting, flat fee." One number, not a percent, so nobody feels like I'm picking their pocket. If they ask, I tell them straight: I don't make money on your tile, I make money on my hours, and your bowed plywood costs me hours. Cracked a joke to my wife that I should start charging by the banana, since that's the unit of measure for bent lumber. Say it plain and most folks get it, and the ones who don't were gonna be a headache anyway.