They are fen trap tight with their wallets here. They didn't build their collections from splashing the cash.
I usually sell on the open sales section. If it doesn't go try again six months down the line.
Some private messages are just trying their luck. Often months later an private message pops up, and rarely quibbles with the price. They know they "must" have it having window shopped too long.

If you have something rare and good then lowering the price doesn't actually find a sale any faster as there still has to be a buyer with the cash.
Often there is the cash later in the year. When Christmas credit cards are paid off, or last tips from the Shooting season.
News does travel but not fast and many big collectors just don't check sales sections that often.

Yes, you may have made the decision to let it go. But you might have to be patient.