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There are actually 4 pixels there that have NO STARS at all, and many more where there are 1-5 stars. Since the photometric precision is very limited (typically 0.2 mag precision), and light clouds can make many of the stars undetectable, there's not much that can be done with the photometry.
And just for good measure, here's a pretty movie. Upper left is the median-binned all-sky image, upper right is the image differenced with the previous image, and lower left is the all-sky frame differenced with the dark-time median image. A pretty contrail goes by.
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