You can math it out, and over any significant time table it may make sense economically, but even if it didn't I would still opt for darn tough. I have many staples in the BIFL as far as clothing is concerned. Don't get me wrong, I like things not failing annually, but for me the most important thing is fit and feel. Darn Tough socks are the only pair of socks I have ever actually enjoyed wearing, they breath well, they don't stink after a long day, and they are just super comfortable.