That is your own opinion. The Saudis doesn't care how much you worth but how eager they need your service. Sallah should go to SPL if he has a good offer and retire there instead, of going to a club that will bring down his pay. However, he has the choice to make either to leave or stay.
We will see the final decision at the end of this season, if Liverpool performance doesn't improve then I'm sure Liverpool will think about letting him go. The reason is the salary burden, Liverpool spend £400K per week on this player if the performance is not as expected then the right choice is to let him go and give opportunities to other or new players with lower or the same budget. We know there are many clubs interested in Mo Salah but if we talk about salary, I think only Saudi clubs can afford it, I'm not saying other clubs like PSG don't have the money but it's not worth it for them.