I think that there should be a War Boost Reward for the Alliance that pulls the most skulls in every War Season, as sometimes it is not always the Alliance with the most Fiefdoms, it can depend on how many battles you have had to face in each round, and is very unfair that your Alliance may have fought many more battles, gained more skulls and have absolutely nothing to show for it at the end.
For those skulls scored individual members get chests as reward. I think that is already enough.
There is a bright side of being unfortunate as a team and having multiple wars per day. Members can gain more and hopefully some uber chests. Why even wanting a war boost while not ending at first three places?