You are missing the point mate, this skin is made to mimic sky, down to finer details which it does do whether or not vix has the functionality for a menu at the top or not. If you removed that "useless" graphic the skin wouldn't look as good and people would miss it. By your logic you wouldn't include any graphic that doesn't do something - what sort of UX would that be? This skin (in my opinion) is light years ahead of the default theme on ViX or vix night because it includes graphics that make my box look more like sky
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I know I keep rambling on about the channel list screen lol but it is perhaps the screen my family uses the most. The graphic you say is to make the interface user friendly but all it does is make the text smaller and so has the opposite effect as you end up with a smaller video display, less program description information and perhaps squinting at the text if you are sat a reasonable distance away.