Can you elaborate on this? If you bought something from me then I think you paid too much and you think that you paid too little. That's, like, how buying thing

Can you elaborate on this? If you bought something from me then I think you paid too much and you think that you paid too little. That's, like, how buying things works. I wouldn't sell it to you if I thought you were paying too little and you wouldn't buy it from me if you thought you were paying too much.