This assumption is hilarious and misinformed. YES, you would sell more units IF you would take 2 days of your engineers time to solve this very simple problem. The vast majority of machine shops and designers DO USE inches and feet and not the metric system. I cannot stand CURA for this reason alone. I have owned 5 Ultimakers and sold 4 of them partly because the software is so hard to use. Most other 3d printer software DOES offer conversion to inches. I'm working on a project right now that would have been set up in seconds on my other printers, but because I'm running it on Cura for the S5,