This was my thought also. And the words “savvy enough” (@Grey_Devil) hide a multitude of skills, let alone the availability of time (also disregarding capital cost funding costs). I wonder how many projects before break-even is achieved and how much time they would consume. I doubt that represents a break-even other than rarely, once time is factored in.
No doubt if I had a 3D printer and the software and user interface skills to design stuff, I’d have made my own handle too. (Actually I solved my broken scissor handle problem with a lump of Sugru. Worked for a while.)
I fear a more general tendency in some quarters to revert to artisan self-sufficiency that ultimately leads to people having to knit their own food, grow their own bicycles, and so on, and have no time to do anything else. Still, after the Trumpocalypse we’ll all need to revert to this. Better get started. 
