I agree although often the "the worth(lessness) to the team" is determined by fans, and sadly the talent spotting of fans is a little suspect. I recall a couple of seasons ago, the cries and demands were for Reo-Coker and/or Sidwell. Now look at where those two are. [These two players are part of the reason why I do not buy into the demands that Scott Parker be bought.]
Also, I think that the value of players should not be judged purely on what they bring to a 90 minute match.