I have a Stihl weed eater that I haven't been able to start in two years. It's hanging on the shed wall, a waste of space.Problem is, I think most of us really don't know how to "tune" a gas engine, let alone keep it running right, without bringing it into the repair shop periodically for tune-ups and maintenance. That costs big money for labor these days. The labor cost alone exceeds the value of many used gas machines.
My battery-operated tools never need that type of maintenance or tune-ups. I'll let you know if/when any of my battery motors dies on me. I have battery grass trimmers over 10 years old now and still running like new with a fresh battery. I used to have to replace a gas trimmer every 2-3 years because of carburetor problems and the cost of repair exceeded the value of the used machine. I look forward to replacing my gas engines as fast as I can with electric motors - when the performance equals or exceeds the gas engines.