It's all about money. Why didn't Boumsong accept a move from Juve ? His huge salary, of course. Why do players leave their mid-table teams where they are stars and go to top teams where they do nothing but warm the bench ? Much bigger salaries, of course.
Lazio's salary list (according to Gazzetta)
Baronio 750 000 EUR per year (their highest paid player)
Rocchi and 6 more players get 500 000 per year
Pandev 450 000 Eur
De Silvestri 100 000 EUR
Compare it with the salaries of our players where 18 players get over 1m Eur, and where players like Birindelli or Olivera have higher wages than Lazio's highest paid player.
There is a huge gap between the wages players get in Juve, Milan and Inter and the wages they get in the other teams.
For example, Fiorentina's highest paid players Mutu and Frey get 1.5m EUR per year, Palermo's highest paid players Barzagli and Amauri get 1m EUR per year, Udinese's highest paid player Di Natale gets 650 000 per year, Sampdoria's Cassano gets 1.2m EUR per year while Favalli has a salary of 2m EUR , Boumsong gets 2.5m EUR, Maxwell gets 2m EUR