Because things cannot be that must not be.
All their prized 'alpha' binos would suddenly not be so alpha anymore. They would no longer be so exclusive. The immense amounts of money they spent on them would suddenly be wasted because now some common oik who doesn't give a fig about the perceived cachet of a Swaro NL could enjoy the same good view which they believed to be their private and precious domain. Never mind the fact, that even if the quality of those Chinese bins isn't quite up to snuff, one can buy nearly seven SRBCs for the price of one NL which almost makes sending them for repairs moot. Let us also not forget that for many this attitude is a matter of clownish politics and crude propaganda.
And the so-called alphas cost what they do for a number of reasons: cachet, marketing, quality, r&d, and because people will pay the asking price. Especially now that even those companies are beginning to move production to cheap labour countries like China, Phillipines, etc. in order to drop the price a little bit while still increasing profit margins. If they kept production here they would go out of business because even most of the 'alphisti' will eventually find that their pockets are not deep enough to afford alphas actually MADE in western Europe. Except maybe one or two that even flaunt their wealth to make themselves feel better than the rest of us here. (I do not mean folks like @chill6x6 who just love sharing pix of their nice collection)
I also trust Canip's and Mssrs. Merlitz and English's appraisal of those bins. Will I now rush out to buy one and have it sent over from China? No, because I am happy with what I have and do not suffer from envy and resentment.