In Clash of Clans, I think level should be the determinant in PvP, rather than trophies. This is because it's not exactly fair when a level 90 something attacks a level 50 and takes massive loot, because they lose battles on purpose to lower their trophy count.
I think players shouldn't be able to purposely lose to towns (using 1 archer/barb) in order to take advantage of the system and prey on lower levelled players.
Opinions?

