When taking revenge at a higher medal count the amount you gain is typically way more than they get, ie. if you lose an attack and 1 medal, chances are you can gain around 30 medals in revenge. other scenarios, if someone you know attacks you, you have to take revenge to say what's up. If you see someone dropping by means of a single fusilier, chances are they are loaded, take revenge. If someone gets demolished by your tc troops, hit revenge and show them how to use sabotage. If someone gets 100% 5*'s on your base hit revenge, even if they are a 190 global, let them know you're not intimidated or afraid to lose.