Does Loyalty Still Exist?

Boleiro takes a nice look at player's loyalty to a team in the Brazilian game. He points out how players like Magrão play for one team, swear they'll never play for a rival and yet turn around and do so. It brings to mind Matthew Le Tissier who played 444 leagues games (162 goals) for Southampton FC. Saints were the only club he ever played for and a move to a bigger club would have likely brought him in to English national team picture more than the 8 caps he earned. Is this why players move? Is it just money or also for a change for more glory with their country?