It's simple: there is no reason on earth we should consent to selling him on the cheap. We don't HAVE to sell him - he's got three years left on his contract. Therefore we should be taking a strong position with United, like Spurs have with Madrid, and set a big price. It's got nothing to do with whether his talent matches up with a given figure, it's all about us getting something we want in return for Felli - I think we want the best part of £40m far more than we want £2om. If they don't want to pay the price we specify, fine - we'll keep him. Many on here seem to be convinced that we have no choice and we HAVE to let him leave for whatever pi$$-awful lowball bid is offered. I'm pretty sure we have improved our financial position by seeing Mucha, Hitz, Neville and Moyes depart and replacing them with players and a manager on lower wages, and we've not spent much on transfer fees in the process.
As I have pointed out elsewhere, selling four fringe players to raise less than £10m and free up maybe £150k a week in wages is not very clever. We would lose the existing cover we have for injuries in return for an insufficient transfer fund. Staying as we are would be better; selling Felli for £30m+ would also be better. And you're ignoring completely the possibility that no-one wants the players you want to sell.
You're right about Lukaku /Ba though.