stripping wire

I don't bother with any standard power cords. I leave them as is and get insulated #2 pricing for them. I thought stripping appliance cords(220V dryers and ovens) would yield a good amount of copper. However, I weighed one, stripped it and calculated that it is better to leave it as is then to strip it down. The insulation is very thick on the appliance cords and it has to be stripped by hand. I could not get is stripped using my drill powered wire stripper. So, I leave them or I sell them on CL for $10. The same goes for romex wire. I don't strip anything smaller than 12awg. Why strip off the insulation when you can get paid for it.