When I did 'Battlestar Galactica' it was the first time I really understood science fiction. That was a very political drama but set in spaceships so people didn't really take it seriously. But some really fascinating things were explored in that.
If I pick up a book with spaceships on the cover I want spaceships. If I see one with dragons I want there to be dragons inside the book. Proper labeling. Ethical labeling. I don't want to open up my cornflakes and find that they're full of pebbles... You need to respect the reader enough not to call it something it isn't.
I'll confess right here that I secretly wish I'd have drawn a strip about a little boy with a fake tiger going for adventures throughout the universe in spaceships of his imagination.