Buying luxury items (cars, houses) increases your "fame" but costs money that could be invested back into your training facilities.
Soccer Life II - Strategy Guide - PlayStation 2 - By ViperMask
Unlike FIFA or PES , this game requires you to manage your life off the pitch.
"La vita calcistica 2" most likely refers to the PlayStation 2 game (released in Europe and Japan), which is a unique life-simulation and management hybrid where you control the career and personal life of a professional footballer.
Was this the PlayStation 2 game you were asking about, or were you referring to a specific career mode in a different title?
Pay close attention to your agent's initial advice. They will guide you on placing your first training center in one of the five available countries.