It isn't about the performance. I got a few cables from monoprice and I was less than impressed with the build quality. I haven't received anything from Bluejeans that totally satisfied me or exceeded my expectations. I use Monoprice for some things, but I am not sure if interconnects/cables will be one of them going forward.
Even if I do disagree with you about the build quality (except perhaps for the mch analogs, but we are talking about an extreme difference in price there), at least you explained yourself.
When people say BJC is better, I wish they offered their reasoning more often (because it's usually never). I'm fine if that may be due to more American material/labor (if only with their most expensive cables), or perhaps because they stand up to the man (Mon$ter).
The problem I have is that people think it's just better for no apparent reason, and offer them as superior for no apparent reason.
With 12AWG from both, I find the Mono was easier to deal with, not only with stripping insulation, but because the strands are already twisted.
My Mono HDMI cables are beefier than my BJC cables.
The coax/sub cables from Mono are not the beefiest I've ever seen, and they are a bit too easy to pull out. However, I am guessing that a BJC cable might be 10x the price, going by my mch analog experiences. So, it's hard to compare there, for me.
I've never used Mono optical in my own system, but at $2 apiece, they are the thickest I've ever seen, and are a great value. I've bought em for others. Like the coax/sub cables, they can be a bit too easy to pull out, though the actual input on the component often plays a part here.
I do believe Mono products are packaged better; I remember ThA tRiXtA being extremely disappointed with the packaging on his BJC stuff for his dedicated theater.
my 2 cents. (though I've spent triple digits worth with both companies).