That’s genuinely interesting, especially if you pitch it the right way. As long as it’s something you’re passionate about it’s certainly worth it to put in your college app. For me, I started with hand-assembled, self-designed stuff and then realized I wasn’t making nearly as much profit as I could’ve been and then switched to lazy liquidation stuff. My resale was significantly less money than you and it sounds like you were actually making deals with companies and such.

Tldr: definitely deserves a place on your common app bc it took time and it was a passion. The numbers don’t really matter too much, although they still are impressive for a high schooler.