A customer is free to make their own assessment as to how they wish to receive a product they are considering purchasing.
Considering can also require a allocation of time to be allowed for.
It can be a short duration, to confirm the intent to purchase, such as hit the Buy it Now tool with no prior inquiry, through to making inquiries to see if the item is worthy of a continued consideration.
I would consider a Cartridge if an interest was present, if it was a vintage item, offered with a proof, a complete overhaul of all critical parts in the assembly have been exchanged for equivalent parts to ensure the longevity of the function is addressed. I would not consider this Cartridge a mimic of the Manufactured Model.
A vintage Cart' with a 'retip' only, that equates to a Styli being replaced, would not be a item of attraction to myself.
A Cart' with a short period of time behind it, from when it was a New Purchase Item, if offered with a 'retip' only, that equates to a Styli being replaced, would present itself as an Item I would consider, the more learnt from inquires made, about the 'retip' service and the Cart's previous usage, would underpin the idea the Cart' is worth considering, when the returned reports are meeting the expectations I be wanting to have for the Cart'.
In the same way a Seller can choose a Buyer if interest in a item is high, or refuse an offer from a buyer, the Buyer can refuse to continue dealing with a seller or decide to not pursue the purchase of the item any further, all seems quite fair for both parties.