Hi john2,
The "Get HTML" button is used to retrieve the html that generates the item details section of the listing, including the template, images, and description.
This feature can be used if you would like to post a listing directly through eBay while using Auctiva's templates and image hosting or if you would like to revise an active listing to add or change a template.
The Sellathon counter should not appear in the listing preview but it should appear when the listing is posted to eBay.
-Mike