A short video demonstrating why I strip almost all the copper wire I get including Christmas lights. I do not do scrapping full time as I have a full time job. So I scrap in my spare time or between jobs as filler work. The prices I used were from Sept. 2014. At that time low grade ins. wire was $0.20 / lb and bare bright was $2.60 / lb. Prices have fallen since then so they would need to be adjusted for today's price.
The wire stripper I use is the WS-001 Scrap Wire stripper from RBF Products. https://www.rbfproductsinc.com It's ease of use makes stripping wire a lot easier to justify stripping almost everything.