I can buy you once but I can sell you twice
You buy someone once but sell them twice and then you walk away like nothing happened. It means you’re a total snake and they’re the one who got burned.
He bought his friend a job and then sold him to his boss and then sold him for $50. He’s a total snake.
She bought her cousin a laptop and then sold him to a guy who paid $10 and then sold him for $5. She’s a total cheapskate.
He bought that guy a pizza and then sold him to the delivery guy and then sold him for $2. He’s a total snake.