Perhaps you are correct about my conceptual failings, though you might have expressed it more politely.
Consider this:-
A builder constructs a boat, the sale price includes
Material costs £100
Labour £100
Workshop overheads £100
Sundry £100
A profit margin £100
VAT £100
Total £600
He sells the boat for the £600, the costs have been honestly calculated so the builder gets only £100 on the deal. Is the boat, in the purchasers hands, worth £600 (how?), £500 (arguable) or £400 (what a buyer might say).
Anyway the resale market price is what the seller says it is, the actual price is what a buyer will pay.