Brian, just do the math and it is easy to see why. I make my own 'kits' for so-called kitless work. My labour is not the most expensive out there, but I budget to make £40 for every hour I work. (This is the result of a tedious but relatively simple calculation which boils down to acknowledging that you only get paid for about one hour in five, so your hourly rate needs to reflect the unpaid hours.) To make up the components takes me about 1.5 hours, so if I sold them I would be needing to ask £60 just to cover my costs! BUT there's no point doing it if it's not profitable, so I'd need to add a profit margin to that. Any takers keen to buy my 'kits'? Nah, didn't think so.
Why is my labour so much more costly than that of my Chinese counterpart? Simples - I live a much more pampered life. My first world house, first world car, first world education for my kids, first world road system, first world television channels etc etc etc make it essential that I demand higher rate for my time. Would I want to swap places with Xhiang Li? Nope ...
So let's face it, manufacturing has departed the shores of the First World and it won't be coming back before the collapse of this civilisation - and we actually wouldn't want it any other way. If you disagree with me ask yourself this: If Xhiang Li had a clip fall off his Junior Gent would he be ranting about an 'expectation of fitness for purpose'? If his cheese biscuit was soggy would he expect a judge to renegotiate his contract with the restaurant? Nope - those are luxuries reserved for us pampered non-manufacturing first worlders.
I'll stop now ...