People who don't rate this geezer just don't know enough about football I'm afraid, that's the bottom line.
And I understand the argument - sell him for a good price and reinvest - but one needs to consider I) how much worse does the sale make the side in the short-to-medium term; II) how much time does the club have to reinvest the cash from the sale back into the market; and III) that this is Everton.
You cannot, therefore, in any sane world, want to sell this bloke. He is comfortably our best player and selling him would weaken the side in the immediate and short term, with no guarantee that we would replace his quality. We sell, we go down IMHO
I for one am also fed up of Everton selling their best players. I have seen no progression in the team under that policy and would rather we held onto as many of our best assets as we can, even if it was against their will. If we kept some of those assets A) we would be able to attract better players to sign to play alongside them; B) the football would be better to watch; C) we would be in a much more comfortable position in the league; and D) we would be a tougher team to negotiate with.
Say what you want about Levy at Spurs, but there is a reason why they attract and retain such quality.