VPP app for business worldwide distribution
After explaining a couple of times the situation, the App is now distributed on iTunes. 

VPP is very country-specific, so if your client is a multi-national which has business in various countries (and some countries don't even have VPP so far, see Russia) you can still have your app published on the "public" iTunes. 

Pay attention that this approval process will last at least 1 month.