@nandric These evaluations being made by yourself, on the idea certain Cart's are not being effected by deterioration as a result of having a long life since being issued and used are heavily laden subjective opinion, as it is for anybody who makes their evaluations known about Cart's with a long life behind them since being new.
There is also the idea once more forming, that an effort is being made for creating a self-advantageous position. It does seem that by giving such subjective appraisal that negates the idea, flaw is developing, will assist with maintaining or even ascending the financial value of the Cart'. Adding the idea that there is also a rarity of such Cart's will always be good for the achievement to be realised.
I'm throwing cautiousness to the wind, I no longer see how this Thread has anything to do with the OP, it seems to me, that it is leaning toward the notion that a priming is being undertaken for an upcoming event, the ground is being tested for producing a convincing theory.
Attempt's are appearing to be made, to create the suggestion that Cart's with deterioration resulting from wear and tear, are worthy of having an amplified Value placed on it. Especially, if there is also the intent to add some other versions of a romanticism about the origin of the Cart' being included in a description to a party showing a interest. The question is how much value can be added, especially, if the addition of the added Value is to be seen as being converted into a asking price.