Too Many Catelogs!
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By my knowledge, if there are not so many people, its better to provide only one place to gather people together, to keep vitality and produce contents.
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It's not about how many people there are, let alone how often they post, but WHAT they post and IF it's anything of one's interest.
Not only I ignore a lot of categories, I also block people who only post stuff I don't care about. I don't mind seeing less posts and having less topics to interact, it's better for me this way.
Bear in mind that there is a Recent menu where every post from every category is available in order of last interaction. Everything shows up there, except for the categories you have chosen to ignore.