For games like Juventus-Napoli / Catania-Palermo / Roma-Napoli absolutely not. The sale of tickets for visiting supporters is prohibited, away stands are empty. If we take Juventus-Napoli as example, if the match is played in Turin you can't buy any ticket if you live in Campania (the region in which Naples is located). Recently they prohibited Lazio fans (probably at the moment the worst supporters of Italy) to reach Marseille for the UEL match for the same reason. The main problem with these "supporters" of these big clubs is that we are talking about real criminals, their "leaders" are controlled by the most important and powerful criminal organizations in the world (especially 'Ndrangheta, which rules Juventus supporters), because it's a real business for them.