Every modder has the bin: the stock controller you pulled, last year's battery, the fork you replaced, the sprocket you swapped for gearing. All of it works fine. All of it is worth money. And almost none of it ever gets sold — it just sits there as "I'll list it eventually."
Reframe how you think about cost. The real price of an upgrade isn't the sticker on the new part — it's the new part minus what your old one is worth. That stock controller might be worth a few hundred dollars to the next rider who's still on stock. Sell it, and your "expensive" upgrade just got a lot cheaper. Do that consistently and the hobby starts funding itself: old upgrades pay for new ones.
The reason most of us don't bother is friction — listing it, dealing with lowballers and no-shows, shipping a heavy battery to a stranger. That's exactly the gap Emotoplace is built to close: see what your displaced parts are actually worth, list them in a couple clicks, and let escrow protect both sides so you're not chasing payment or trust.
So before that old part disappears into the bin: it's not clutter, it's your next mod's down payment. Sell what you replace, and ride more for less.