I think Starbow should have its own category, because some people only play Starbow, and some people are only interested in watching Starbow.
Also, if you want to watch normal StarCraft 2, you probably have no interest in watching Starbow. Either way, they're basically different games, and you should know what you're getting. This isn't just any arcade map for StarCraft 2. It has its own tournaments, its own dedicated players, and so on.