It is difficult for young players to overcome the power of money, historically we have seen that Neymar and Mbappe could not overcome that, and they went to PSG. Coming to PSG is also a way to increase their value, no European club will be willing to pay them such a high salary. And with the current situation of Lamine Yamal or Osimhen coming to PSG, it is still better for them to continue to stay with their old team. Barcelona and Napoli are two very difficult teams to compete in domestic tournaments. As for the UCL tournament, that is also far away.
If the mission is successful, Lamine Yamal or Osimhen could become the third most expensive rookie in PSG history. We have seen Kylian Mbappé leave PSG to move to Real Madrid to develop his career, but even though he is currently the most soughs-after player, I bet that Real Madrid will not pay his salary as high as PSG.