That would restrict it to locksmith basically (professional or hobbyist), as opposed to anyone that can find out how to run a 3D printer. Being a locksmith isn't scalable, using a 3D printer is.
No, if you can make a 3D printed model of it, you can CNC mill it. Sure, a CNC milling machine is a bit more expensive than the cheapest 3D printers, but anyone who wants can find a machine shop nearby that will mill something for them, or just send it off to some place online like eMachineShop to get it done.
and actually, it's not even that much more expensive. You can get a CNC Sherline mill for something like a $1500. Sure - the work area is small, they're mainly aimed at e.g. model builders, but it's big enough for something like this, and they're real honest to goodness CNC precision machine centers.
