Well clearly I don't need to stop there. My point was that Coutinho, in liverpool's eyes, isn't replaceable. No, he's not Suarez but he has been their best player in their last few seasons (though Mane looks like taking that mantle now) and they know full well themselves that they won't get a player as good as him with the money they get from him.
What's the point in them getting £100m if they know they won't be able to spend it on a player as good as Coutinho?
Then, as others mentioned, there's the fact that every other club will know they have this money, and, as we're seeing with Barca, will try to complete fleece them for any player they go for.