With the new TV deal and the amount of money even the midtable sides are going to be getting, I'd be amazed if any of those players went for less than £40m, £50m isn't a stretch at all (except for Barkley). There is just no reason for Everton to sell for less than that, they will have an absolute shit load of cash anyway and no matter how much money they have they won't be able to buy a similar replacement. £50m might get you a De Bruyne from Germany, but a De Bruyne caliber player won't want to go to a midtable team like Everton, even if they can afford it. The money becomes a bit pointless as you can't really do much with it (like Liverpool and Spurs with the Suarez/Bale money). It's easier to keep hold of the players. The only reason Everton would sell any of them is because the player forces them to and even then they would make people pay through the nose. The value in the Premier League is only going to get worse and worse as the teams get more and more TV money.