Well you might be right in theory. If there was a market for faulty 4K-displays having Mura.
But in practice: Who would buy them?
If you had a company using displays, would you buy batches of faulty 4K-displays having Mura? How many? For what purpose?
See, I am working in a steel mill for more than ten years now.
We are producing high quality steels, some million tons per year. But as you can imagine, often enough our melts donât meet the customers specifications and requirements. Yes, most of them can be used for other specâs and other products, and then, they will be used alternatively, for sure.
But first: This used to be common practice when I started there - the marketâs general conditions werenât as tight as they became in the last ten years. Since then, many things changed. And second there simply isnât enough demand for faulty melts any more - we already have supplied the global 20 year demand of flat washers
⌠further more not being the only steel mill in Germany nor in Europe or the rest of the world 
Of course I donât know anything about the modern display manufacturing, market and alternative possible applications.
But if it was that easy, why then Mura occurs more often in customer products since a couple of years and the more performant and ambitious the display applications getâŚ? As mentioned by my other refered links, itâs not only Pimax 8K-X having MuraâŚ
According to this
, preventing Mura is getting ever more difficult the more challenging the display application gets. So does the faulty / Mura display rate over the whole display industry increase.
All theoretically wanting to sell their faulty units to someone else 
Last but not least, all my refered links mentioned, Mura was not repairable.
Donât you think if it was that easy, too, to predict the effect and neutralize it via soft-/firmware, every company whose products are hit by Mura would not already try to do so? This too, would certainly be cheaper than rejecting whole display batches or calm down upset customer complaints 
Of course, it might also be that simply nobody did so yet 
But as Mura existed already long before Pimax 8K-X, I doubt all the display manufacturers just lay back and relax 
Last but not least:
I totally understand you from our customer point of view: We payed several hundreds of Dollars for a high-end VR HMD, and apparently the majority of us is getting suboptimal HMDâs with Mura. That is annoying or even worse, depending on the individual grade of Mura.
But it might well be it is simply not as easy to resolve, sort out or neutralize as we all wish it would be 