I'm from netherlands, i wish that auctivia was on ebay.nl as well, i don't think that it has to do with permission, but coz of the different language.
Currency problem i don't think that that's the case either, as u can list on ebay.com , ebay.com.au & ebay.co.uk with auctivia
I wrote to ebay.nl helpdesk once to ask if they could ask auctiva, they said that i could do that IF the site ( auctiva.com ) was able to list on ebay.nl
THUS auctiva.com has to expand ( upgrade ) to list on sites sutch as ebay.nl ebay.be ebay.fr ebay.de etc.
Those are in foreign language, so they would have to have foreign employees or a good translationsite or work with a ebay employee.
That's the main problem i think ( the language barrier )