I have dug ditches, I've also written software. Digging ditches is harder. I also explicitly was referring to doing it manually, not with a machine. There's some philosophical conversation to be had here with the satisfaction of work with tangible outcomes vs intangible outcomes, but that wasn't the point of my comment, it was about supply/demand. You can get unskilled day laborers to dig ditches, you cannot get unskilled day laborers to write software.