Many of your points are incorrect or not applicable.
In particular, as far as I can see, the OP has never specified a selling price. The selling price may be the current new price of a Librem 5 (which is comparatively expensive and potentially not attractive since a purchaser may prefer just to buy a new device from Purism). The selling price may be the seller’s original purchase price (substantially less than the current new price). The selling price may be some other amount.
Failure to nominate a price may be a contributing factor.
I would like to suggest another possible contributing factor: Purism must be really close to shipping parity. So the “impatient market” of people who decided to jump the queue by buying someone else’s phone is rapidly disappearing.