That's a drop of water in the ocean, really. In a forum as big as this one, you can't really hope to avoid that problem, unless the software allows you for deeply nested sub-forums. If an uncluttered forum is what you want, you should go with a character specialized one, although most of them aren't actually very well organized, either.
Back to the question at hand, different characters should have their respective appreciation threads, and if one of them has more or less activity, just let chips fall where they may.