I think that it also depends on your ability to do the repairs yourself. If you pay to have your injectors removed, rebuilt, rebuilt, and installed you want to use the best quaity nozzles so you will not have to pay to do it all over again.
In my case I have the Nozzle tester and the on the job experience to do everthing including the injector rebuilding myself. When I overhauled the injectors on my car I used Brand X Italian nozzles at $10.68 each. When I bought them I did not know where they were made; they could just have easily been from China. I had a just bought a used Mercedes that ran rough at idle and I wanted to get it running and on the road. With the cheap nozzles I had money left over for the other things that needed to be done to get the car road worthy.
Now that 11 months has gone buy I am thinking to upgrade my nozzles to Monark nozzles (C Sean Watts is selling them) as they offer a good price with good quality. I would like Bosios but they cost too much for me right now.
Cheap Chinese nozzles would are like cheap tools they can help you for a certain peroid of time but I would not expect them to have the same performance in the long run as higher quality products.
Lastly the point that a lot of people made is true; they have the ability to make high quality products but our business people are not ordering them and offering them for sale to us.

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84 300D, 82 Volvo 244Gl Diesel