Supply and demand. That's what it comes down to. As long as there is a demand for luxury goods, and people who can afford it continue consuming massive amounts of "stuff," there will remain a black market for those that can't buy the real deal. We live in a society where success is measured by what you own - your house, car, clothing, bags, etc. We are always on a quest for a higher social status. Although I was unaware of how big the replica goods industry was until coming across this thread, it does not surprise me that so many people are purchasing counterfeit products to acquire or uphold an aspirational life.
I watched an interesting documentary a few months ago on Youtube about consumerism. They explained the idiom "keeping up with the Joneses" and where it came from. They talked about how the phrase really came to life in the 70s (if I'm remembering correctly) when consumerism in America was on the uprise, as the availability of goods was becoming stronger. People used their neighbors as a measure of who they should aspire to be like. The documentary talked about how at that time, you were striving to keep up with people in similar socioeconomic backgrounds, obviously because these were the people that were physically around you. Now, in 2021, everything is different. We have social media platforms that provide us with access to any and everyone. I can go on Instagram right now and see what the ultra-rich are buying and doing. I can go on Youtube and watch Kylie Jenner's closet tour and dream of Himalayan Birkin. The point is, the Joneses, are no longer just our neighbors. We are now comparing ourselves to literally everyone.
While I'm not trying to say that people who buy replicas are without culpability (although one could argue that many consumers are completely unaware of what their money is funding, as I am someone who never heard that fakes fund terrorism, etc.), I do think that we have to look at consumerism as a whole and discuss why we've made these things, which are literally just stitched leather with some embellishments, as a status symbol.
I think this topic is very fascinating, especially as I am currently attempting to become a more ethical consumer. Glad I came across this thread.