So about 30 cents product needed to do 1 car, but you need to buy enough to do 50 cars.
Start taking orders John. Figure out the cost to do one car including your time and offer it as a service. Restoration work is often billed at or around $75/hr.
so going by that, and if you can build both harnesses in a half hour or less, it would be deemed profitable when compared to an "already done" reproduction Alloy Metal harness.
OK, sorry about the sarcasm
I would consider fixing mine too if it truly seemed reasonable or if the reproductions epically failed but for a car such as I have with the Deluxe interior, door speakers AND the Door Ajar wire (total of 5 wires) splicing all of them up to 2-times each to replace the wire in the flex-zone seems to be a lot of work to do, with what is already available and done without any splicing. That's the nickel version of my 2 cents.