So if you are surprised to find a $20 bill in your couch, your disappointment at having lost $20 some time in the past is equal to your pleasure at now having $20 more than you did a moment ago?

That depends rather a lot on my dopamine levels and thought patterns. I gain much more pleasure from finding cash than I am disappointed at losing it. Hang on... Excuse me. Going for a walk around my house with my wallet open.