I've recently bought many domains (1000+ over the last year). A few of them (the more valuable ones) all had TXT records for `@` (the root) that had for-sale info. This new record is just a TXT record anyway, proving the point that the interested buyer can quite easily learn of a domain for sale with existing mechanisms.

Also, for domains that are just "parked", not in current use, obviously the parking page can just have a for-sale banner. This is exceedingly common.

> Enquiries that would have been welcome never arrive, and the ones that do arrive are indistinguishable from spam.

Laughable misrepresentation.