If you discover Finale will not push a stock qty of zero to eBay listings and the eBay error message is "not not allowing any quantity less than 1", the issue may be caused to eBay misconfiguration.
Please make sure the "Use the out-of-stock option" is enabled. Please see screenshot below.
To enable the out-of-stock option:
Go to My eBay > Account > Site Preferences orSeller Hub > Overview > Shortcuts > Site Preferences.
In the Selling Preferences section, click Show next to Sell Your Item form and listings.
Click edit next to Use the out-of-stock option.
Make your selection and click Submit.