i'm currently reading akaboshi (ch. 8), because a lot suggested it, but i can clearly see why it failed at the toc's. Most of the story is only about to go from one fight to the next with a few sentences between them. It seems to me that japanese kidz don't like battles at all. there are exceptions like grand battle with favourite characters, but most of them.
Look at the bottom 5 and see for yourself. Medaka (student council battle), Oumagi(aqua park battles), KHR(shimon family). I don't no about mago and hokenshitsu, but my guess is "they lost their fans because of long battle arc's".
Even popular mangas like bleach naruto arent unaffected. Bleach suffers still from the aizen arc. it's true that its even now ranked low without endless battles, but when the story improves and gets richer in its contents then bleach will ranked better. So whats wrong with naruto?
dont get me wrong with this one. its still in top 3 every week, but it loses often its first place, even in a week without one piece, to mangas like bakuman and gintama. That ins't something what happend one time, but these last few months more often. look what going on in it and you see "countless unimportant battles."
maybe the reason is that most of the mangas are battle mangas and the most interesting fight gets all the votes. so the others looses their points to it because of the similarity.