I tend to use my HF mini lathe and mini mill just as another piwer tool like the drill press, bench grinder, battery drill etc. All require proper setup, safety, and use. Having "machine" tools just give me a lot more options. As the previous poster noted, most bike shops only use available parts or "send it out". They don't have training, time, or access to lathes and mills. Even tasks that were once done in-house like rotor turning, valve grinding, etc. are sent out our just new parts used.