well immagine a scenario where you approach your maximum desired number of villages and believe me there is one for everybody!!!
at that point, hoarding mints is pointless waste so what would you do with those resources?
you can send them to your allies OR you can make some fun from it. wiki says berserker takes 6 provisions and offers attack strength of 300 per unit. that is 11% more than provision equivalent in axemen. you should notice that when overwhelmed, its attack rises to 600 per unit which is 222% increased attack strength compared to its provision equivalent in axemen. in a scenario where you have limited ammount of provisions but relatively unlimited ammount of resources, this is a hell of a viable option. not to mention that it must be just epic to land 3000-3500 berserkers into overcrowded defense village
where one would expect basically any army to be vastly superior than single attack army.
if anybody could just post recruitment times for axemen and berserkers with barracks at lvl 25? i am not that far.....yet
ps: if only this concept behind got to evolve further with like having a "university" or something with various researches that would tweak various things from recruitments time to attack/defense effectivnes that would allow for wider range of strategies than simply overpowering enemies by brute force of having more villages or more allies in ally and stuff...not everybody can spend 6 hours a day just checking on all villages and it would be nice to maintain a certain lvl on competitivness even with limited resources