Title says it all, apparently relisting horses is necessary for visibility. In other words, my 2 Dream horses sitting there for over a year could never be bought, even if someone was interested.
Upon relisting, within a few days I have now sold one. Despite years of trying.
Ticket responses to this claimed everything was working fine, and told me it was a “supply and demand” issue and my horse was just “less desirable”. But it was not the case.