To help buyers with their child theme development
Another theme developer that I use offers a prepared child-theme already built and available for download.
Its just an empty child theme but contains the basics in terms of image, template, import, etc.
It saves them having to answer simple questions about building a child theme.
It's very simple, very quick, saves the user time and questions.
(of course there will always be questions - but not how to start a child theme from scratch).
I recommend that Appthemes also provide a basic child-theme for download.