Benchy/Cantbeatus - Value is relevant to individual circumstance. If Charlie Christie/ICT think that these players are worth those figures to us, then they would be stupid and naive to let them go for any less. Losing 2/3/4 first team players will mean we have to spend time and money replacing them, also means risking our potential for next seasons campaign. Every place is worth something like £70k (more with the additional Setanta money), and a good cup run can put anything up to £500k in the bank. WE have to take all these things in to consideration.
It may have been a different situation (it has in the past) if we were in desperate need of money, but that is not the case, so we are the ones dictating values.
In short, what you or anyone else thinks they are worth doesn't matter in the slightest.