Doing well in lower teams and those lower teams paying those fees you mentioned are two different things. I can see players being released here without selling value.
I think there are a few players that are on the verge of being impossible to sell, but in all seriousness, these players aren't not what we need and we've kind of had to make do because of the previous owners.
But I'm sure the players like Konchesky, Poulsen, Jova and Cole would sell for ok prices because of their experience, and they are very capable of doing well in other leagues, and smaller teams in England.
Ngog will sell because he's probably a 10 goal a season players, which is better than a lot of strikers in the prem and elsewhere. El Zhar is young and has done fairly well in Greece, so he will probably sell.
Degan is rubbish and will be the one who might not sell IMO.