This is go-to strategy for /r/entrepreneur's crowd. If I remember correctly, Tim Ferris even recommends it in "4 Hour Workweek."
I'm fairly certain it started around 4 years ago with Matt Clark's "Amazon Selling Machine." A friend who paid the $1000 let me watch the course and it was a pretty simple (and old) tactic.
Buy wholesale and sell at markup. Except this time you would have it under your own "private label" (i.e a Chinese factory would slap your logo on a generic and sell it to you).
Apparently he made a killing doing the same thing with silicone spatulas.
Wow. Surely the best advice such a course could possibly give would be 'convince people you can teach them to make money, and charge a lot for it'.
Who gets rich in a goldfish, the miners or the person selling the tools?
Edit: Humorless. Sad.
I think it must be the diver because he found the treasure chest, assuming that it isn't counterfeit:
https://www.amazon.com/Bestgoo-Aquarium-Ornament-Live-Action...
So the answer to your question is the latter.
See, for example, http://www.frugalhack.me/2017/02/23/private-labeling-101-int...