I did the math awhile back on a small setup, way smaller than the 250k machine. Could you do a sideline job with it for good extra money? I think so. I just don't think you will be able to really get the volume required to make it viable as a full time thing. Not only that, unless you are basically buying from yards and able to easily get the volume needed in just a couple hours a day, you would have to hire someone to run it while you wrangle wire from the road. That makes it even shadier math.