I don't bother stripping any wire either, Romex or otherwise. I get payed a little more for Romex and CAT 5. A bit less money for insulated wire, but being the insulation adds a good bit of weight, I don't see I'm losing enough to warrant the time / energy cutting off insulation. Some of the wire I get, I'd bet the insulation weighs as much or more than the copper, so the extra weight there "somewhat" gets me closer to what I'd get stripped. At the end of the day, I have no desire to manually strip wire, just not worth it to me.