I think for me, it's an addiction carried over from my dad. He was a specialty industrial welder for many years and made a ton of homeade knives out of high carbon steel cutting blades he would use at work. He would make handles out of delrin or wood usually. He would also take a cheap pocket knife, take it apart and put new blades in he made. Could shave with the stupid things.Knives and led flashlights are my weakness. I've literally got an entire junk drawer full of them. I'm not sure why.
I'm not that handy, but a couple of the ones I bought were favorites of his I remember when I was growing up. This last one just seems like something he would make.