I think he uses a wireframe view of 512x384 because it fit's well in a 800x600 desktop. Most people have a desktop res of 1024x768, so it's sort of a standard final-render output res. That way you can use the image as background for instance. And if you want to print your image as a poster you'll end up rendering at high resolutions. Mostly between 2560 and 6000 pixels wide or high. However these resolutions are not very handy when you want to view the wireframe. That's why most of us render at different resolutions as the wireframe-view.

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