Tim,
I may not have explained myself properly so I'll try again.
If you have something to sell that is of worth, why not get the best price for it you can? To limit the price of your item as you don't wan't to sell it to your neighbour is an amazing piece of logic. But no, that's not enough, you also think that is the figure he is worth as that's what the previous club paid for him.
However the most contradictary part of your post is "only had six months left on his contract so he could dictate the clause" but then say "I don't know exactly what his contract said"