WHAT will motivate Paris Saint-Germain when they get tired of winning domestic trophies at a canter? And despite their huge wage bill, growing revenue base and ability to snare any player they choose, how can PSG become more competitive where it really matters – in European competition? Given the amount of cash their owners have spent on player transfers and remuneration, should the French champions not be faring better? PSG’s most recent financial report illustrated how the club has grown over the past eight years into a brand that generates money across multiple revenue streams. Their income of €634 million ranks them among the top half dozen in Europe but they are still some way behind the likes of Barcelona (€ 990m) and Real…