I have noticed the few times I have lost defense that it was from a much more powerful opponent who gained very little for his trouble.
This last time for instance, was not a revenge
attacker used 17 giants at least lv2 and 2 healers and 3 wall breakers. thats 30,000 worth of elixir and a lot of training time right there plus a bunch of archers.
the reward....
11 trophies , 12k gold, 17k elixer.
so are 11 trophies worth that much to some people?

