Personally I don't think that alliances that came about because of someone's efforts and what they did should just be handed to random people because the idea is cool and people like it. If someone starts 'being' that alliance then fine, but I have literally never seen that once. Im talking about things like DS right now.
I answer your question with a question: Why should alliances that are not based on fighting and were not formed by fighting be ruled and governed by fighting? On one hand its too simple, it takes nothing into account of what the alliance is or what the ruler should represent- ie for example, if you put a big bad bull-dog at the head of my alliance, it would totally dismantle the reason it exists in the first place. On the other, its just sheer lazy stupidity to leave it like that. Same with gathering ones, why should fighters rule them? It makes, literally, no sense.
Z