I have pointed this out several times over the years but the error still exists.
https://www.ebid.net/uk/help/selling-on-ebid#faq-2
The fee for a basic Seller account holder to use BuyNow on a standard listing is not £0.00 (i.e. free) - the option to use BuyNow is not applicable to that account/listing type (as is stated in the attached help balloon). £0.00 should be changed to N/A or similar text.