I agree that in cases such as you two pointed out it can help, but as we've gone round and round on before there are too many factors that go into a price, the most frustrating of which is that pricing is self-governed with little to do to control that aspect as it now stands.
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“Aslan didn't tell Pole what would happen. He only told her what to do. That fellow will be the death of us once he's up, I shouldn't wonder. But that doesn't let us off following the signs.” - Puddleglum in The Silver Chair by C. S. Lewis