Please note that the final result I gave (-1.68%) is for the average success story. Therefore at the average, the seller is already selling below the level at which he/she would be satisfied(?) to part with the chips. For a seller with below average success, the results would be much worse.

In any case, I have given you the numbers without any spin. It is up to you whether you wish to attach any importance to them or not, though I should think a professional would.