If I understand you correctly you sell it for what you think it's worth and go up or down. You are describing a market that's how they work. Those 2 large pizzas purchased for 10,000,000,000 sats a decade ago are worth like 100,000 sats now, but that is here. If it cost you 10,000 sats to make a pizza you would sell it for more than 10,000 sats. Pizza has a huge markup though.