I would keep it and keep adding content.
More good content = more traffic = more money. Although the main focus is WoW wallpaper, it doesn't mean you can't add additional information about WoW, such as guides for various things, WoW news, etc. Sign up with a few affiliate programs that have to do with the game. Offer visitors good stuff.
200 visitors a day isn't going to make you much profit, so you need a lot more traffic. It will come as you add more content that people want.
It's a nice-looking site and has mucho potential...just start thinking outside the box and do some groovy things with it.