Ron from your reply I think you do understand what I mean by the price tag being subjective and is therefore the notion of worth related to that price tag becomes very subjective. As you rightly point out some one starving will value that tin of beans with the last penny in his pocket, while if I've just had dinner you may have to pay me to tuck into some baked beans!
But there are other variables in determine price which have little to do with the quality of the player. How much is left on his existing deal being a major factor, as in essence you never buy a player anymore (not since Bossman anyway) but just buy out the existing contract and then have the right to offer a new contract.
I'm not saying transfers costs themselves have no meaning, and if the question is with 15M in the transfer kitty who do we spend it on, player A or player B, then obviously there is a discussion on which player is the better value. However once the money is spent it becomes a redundant discussion. Put it this way what you paid for your house is interesting, but if like most home owners your house is your biggest asset, its what its worth now, or what it might be worth when you’re ready to sell that is more important.