Last year I started making tote bags for friends and family. My DH saw how quickly they go together compared to a quilt and decided it would be a great money maker if I were to make and sell them. When I told him no one would pay what the materials cost not to mention my labor he couldn't figure out why not. When I told him there was at least $50 just in cost plus the labor he agreed no one would pay that. I've also started making ebook reader sleeves and pocket tissue covers. He didn't even mention selling those.
I also think you should encourage your son to do a small project. My boys loved making handmade projects and they learned the value of them. While I am no where near being a perfect quilter, my younger son says I'm making him heirlooms when I give him a quilt. Your son could learn that value too and he might enjoy it so much he could be another Ricky Timms.