Really? You really don't rate the guy do you? I'd wager he's top 5 in the world at the moment. Leeds got that much for Rio 10 years ago. Chelsea paid similar for Shevchenko. We got 35 easily for Alonso. We got 50m for Torres. I'd wager that on present form, a player who scored nearly 30 goals last season should certainly command those transfer fees. For 40m I'd say **** it and keep him. It's not worth it. At the time of Ronaldo's transfer, he wasn't worth 80m either, yet that was what he was worth to Madrid.
40m is essentially one decent transfer window worth of funds (in which you can't really replace a player of Suarez's calibre). Take into account a) agent's fee's, b) lost revenues in terms of shirt sales (massive), c) a sign of weakness/hesitance on improving the squad. All those for a measly 40m? Not for Suarez, who dribbled past half the United team to set up Kuyt. Not for a player who can score from halfway against Norwich. Make no mistake, he is a fantastic player. An unhappy Suarez is still worth more than 40m. He is our sign of relevancy, an idol amongst the Joe Allen's to the millions of youth around the world. A symbol to fellow talents around Europe that Liverpool, despite a rough few years, is still able to attract one of the best players in the world.
Even keeping him on the bench has this effect. Selling him has the effect of telling everyone that we are ****-scared of success and not going to go past "decent, but not world-class".
Though, past 50m and all this changes. If we replace him with a brilliant replacement a la Torres, then fine. It will be uncertain how we will fare. But if anything less, then don't bother.