So we have StockX for shoes where you can see the price graph and sell and bid, and for pc parts we have pcpartpicker and ebay.
My idea is basically a combination of pcpartpicker and ebay. You can see the price history, buy, sell, and bid, all in one place.
Take this example and this one . Now combine them. That's the gist of my idea.
I don't have the means or ability to pursue this idea or anything but if anyone wants to steal my idea go ahead I think it's a good one. (like at least gimmie 1% profits or something lmao)