it's their readers that obsessed, the author just met the demand of costumers. beside that tho, I think it's just "female fantasy" the way like male reader love "power fantasy" story. most time I think it was a reverse harem.
Just like when I see my female friends reading list, it's full of reverse harem (or yaoi) or somewhat like that.
i think its adorable she thought no one would notice her anime eyes. everyone else so far only has single colored eyes and shes got 2 shades of blue and yellow in hers.