Birkin bags are also actually better products for more money, they can last quite a while with minimum care. They are display goods for sure but there is a qualitative difference between a good quality handbag from certain brands and a much cheaper one.
Just as an example, my wife's only handbag is a balenciaga bag that she's had for 12+ years, she's been using it to carry back food from restaurants, put anything she needs in it, etc... and it's still in good shape. In the end, her bag has cost her so far 60 usd/year.
So yes, it's not obvious to people not in the know but even products that seem to be display luxury category can actually be worth it from a quality perspective.