#2 Huge decrease in Liverpool's fan base if players leave
We all know that it's not a secret, a lot of Arabs are following Liverpool's media outlets and visit the actual city to support Liverpool for the sake of Mohamed Salah. While a lot of Senegalese and Guinean people support Liverpool for the sake of Naby Keita and Sadio Mane.
Brazilians as well watch for the sake of Alisson, Fabinho, and Firmino. Also, other supporters from the Netherlands support the club for Virgil Van Dijk and Gini Wjnaldum. These might go in the wind as well.
These supporters might get lost in the way if such players decide to leave Liverpool in order to get more recognition for participation in trophy winning squads. It happened with AS Roma when Salah left and all the Egyptian supporters decided to support Liverpool all the way to a very aggressive extent on social media.