I think it depends how spread out it really is. If every game is played in a different country then it won't work to well, but if say each group played all its games in a set country, then fans would only have to go to one place to see all their countries group games, and would actually make it cheaper as fans of other countries will be going elsewhere
dont know if its such a good idea to have fans criss crossing each other all over the continents rail network, plus the fact fans arriving in cities before other fans have departed could prove to be a security nitemare, especially with German, Dutch and some of these Eastern European countries fans who are extremists and political...