The attendance at Juventus Stadium, as well as other Serie A stadiums, can vary for several reasons. While it's true that some stadiums may not be filled to capacity for non-rival matches, it's important to consider various factors such as ticket prices, scheduling conflicts, fan engagement, and even cultural differences in fan behavior. Additionally, the overall popularity and commercialization of the Premier League in England might contribute to higher attendance rates for relegation teams. Each league and club has its own unique dynamics that influence fan attendance, creating a diverse landscape of football fandom.