Additionally, claim a "daily dock bonus" from a trading boat once per day - choose one of three random Trade Goods.
Note: A player's medal count will never fall below 200.
There is a giant jump for League battle bonus when entering the Kingdom League, from 15k to 40k. From then on, the League battle bonus can make up roughly more than 25% of the total loot of each battle, and it increases as you advance to even higher Leagues.
Many Empire and Dynasty League players just snipe the opponent's Town Center to get the medal and let the League battle bonus be their resources income.
By December 2015, after entering the Kingdom League most of the opponents you find would be worth just 1-5 medals. After entering the Empire League, most of the opponents would be worth just 1 medal (even with five stars), therefore it is no longer worth trying to get 5-star victories.