Yes.
Billing for hosting is based on the quantity of all item's listed on your Bibliopolis site. This includes 'Sold Books' records.
For more info on hosting plans visit:
https://www.bibliopolis.com/pricing
It is easy to delete 'Sold Books' to save space on your hosting plan. However, If you are using your site as your main inventory database contact [email protected] first.
For more info on deleting sold inventory records visit: