There are a number of ways that you can increase the visibility of your domain in the auction service. Here's an article on listing your domains that talks about adding categories for listing and options in the "Increase Visibility" section of your listing.
Lots of sellers also take advantage of their social media connections in LinkedIn and Twitter to promote good domains they have up for sale. It requires a bit of marketing, but we see it all the time. They then send possible buyers back to the GoDaddy listing.
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