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These spending habits apply to ebay and many open markets across the internet. You might think that no one would buy x, y or z for a high price. But there are often rich and wealthy people who will pay a higher price for what things are worth if they see it. Which opens the door to craftsman and makers being able to produce products which will sell at a higher price than expected.
To cite one example, this youtuber bought a stainless steel nut for less than $1 dollar. Grinded and buffed it into a stainless steel ring, which he then resold for $1,000.
https://www.youtube.com/watch?v=xQl2Yn6Hzq8
Of course, this was years ago and since then jewelry markets have been flooded with copycats which no longer makes it possible to reproduce.
But it still shows how someone with a little imagination, tools and skills can resell items to the rich for much more than they're worth.