We had some pretty heavy discussion about the translation server at l10n.privnet. at a German local Group. I was several times accused by guy caled Narres that l10n.privnet lost Ubercart translation suggestions during March 2008 and January 2009. (This was the time no group admin was present) I could testify that the 600 suggestions I have approved in January / February did not inlcude any translations of this guy.
during that discussion the founders of the biggest German Drupal community site put it up somethin like that "they don't know that server, so why da hack should they translate there..." or more like "they are not in control, therefore no translations and work will be carried out." I guess it's pretty the same everywhere.
In common I put it like that: National interessets before global community.
Isn't it possible to have the translation server run at ubercart.org . like l10n.ubercart.org ?

