I wonder if there's an issue of fantasy and sci-fi not having the same status in German literature & TV as it has in the UK or US. There isn't much of a German (original) fantasy or sci-fi book market apart from children's literature and imports from the UK or US for example. I'm no expert and just guessing though, maybe someone here knows more about it?
In America at least, fantasy and sci-fi, while technically mainstream, does have a slight stigma of being rather nerdy.