Spending a lot of money to collect many star players in order to win CL is not wise enough. It shows that PSG want instant achievement but they forget to build a great team that can survive for long time. They have started it since several years back but still unable to win the CL title. It proves that money and collection of star players cant bring instant achievement.
This is very solid point but sadly PSG management is not trying to understand this all as they are spending money for star players and having Champions League in their pocket is just waste of money for last few years they need to do some better strategy and bring few youths those can help them in this way better. It's game of patience and calm, but PSG owner is completely having nothing in his mind and wasting his oil money here without any passion and planning.
If they spend money and create a team for next few years then surely they can stay at top like Bayern or Real Madrid, but they are just spending big amounts and bringing used methods which are not giving them good results and even in this year most chances they will fall again and have nothing good in Champions League.