Ebay Trading
You buy junk from one eBay and scream about it on another eBay for big money. It's like trading, but with more noise and less quality.
He bought a broken microwave for $3 and sold it for $30. The microwave didn’t work. He didn’t care.
I bought 50 pairs of shoes for $2 each and sold them for $15. My shoes are now rich.
She bought a used TV for $10 and sold it for $100. The TV didn’t work. She didn’t care.