Not always that simple. Least for the club's perspective.
Salah is what, 30 this June? He's performing at a level to be considered the best on the planet, but risk will always be assessed for a club when negotiating contracts. Age arguably one of the biggest factors, considering players are at a risk of massively declining once they are in their 30's. Long term profitable sustainability is the key goal for clubs that are not fortunate enough to be bankrolled by their owner.
Spotrac has his current wage at 200kpw. (Not sure if this is before or after the massive bonus structure Liverpool implements in their players contracts.). What amount are the Liverpool correspondents saying Salah is asking for? What ever it is, the two questions Liverpool's financial team will need to answer are "Can we afford it", and "Will this profit us long term"?