According to a more fashion and design orientated friend of mine, you can buy knockoffs of Birkin or any other high-end bag. And, guess what? Some of those knockoffs and their manufacturers have developed a certain cachet, and actually sell for quite high prices. So of course, those have spawned knockoffs too.
It's like the bit in Pattern Recognition, isn't it?
There are whole subreddits devoted to this, the most well-known being repladies, which went private after it got too famous due to an NYT article. People will spend $1000 or more for a really good Birkin knockoff with high quality leather and hardware. The bags are almost all made in workshops in China. Getting one is apparently (I haven’t done it myself) an interesting exercise in trust and reputation: how do you know the seller isn’t going to send you a cheap knockoff from China rather than a “real” $1000 knockoff? In practice there is a whole world of trusted Chinese middlemen with reviews etc. who have a strong stake in keeping their reputation high in the “reps” community (but you’d better make sure the reviews are real…).
I'd bet you a coffee that there are knockoffs, or "reps" if you prefer, that are actually at least in some respects better quality than the original.