I have no dog in this fight; I bought one thing on
ebay one time, and have never listed anything for sale ... though I expect to, one of these days.
That having been said, I do care about sloppy thinking, especially when it comes to other people's character & motivations.
So let us consider the other side of the coin: a buyer.
If the buyer has, say, three months to expertise an item, that is three months during which that same item might come available at one of the major auction houses, at a dealer with their want list, at their local stamp club, at any of the mittelstand auctions at SAN, or at any of the zillions of folks selling on
ebay.
Let's assume innocence: the buyer has stumbled into this temptation, and has not asked for the expertization interval in order to wait for a scheduled public auction to close. It is in the nature of financial transactions that a better deal always looks like a fairer deal, which allows a certain moral flexibility to rear its ugly head.
Meanwhile, on the seller's side, whether/not the item is on consignment, the seller is still being denied cash flow during the expertization interval, still can't show the item to somebody else at an APS stamp show (for example), etc.
Moreover, the seller is aware of the temptation interval, and knows just as little about the character of the buyer as the buyer knows about the character of the seller.
Therefor:
The buyer wants more time, so as to obtain a certificate.
The seller does not want to agree to more time.
The buyer & the seller have not come to terms.
Done.
Cheers,
/s/ ikeyPikey