Short and sweet.  Horse market is somewhat stagnant  and new life needs to be put into horse taming/training.  At one point there were more than 75 pages of T8 mounts that did not sell for long periods of time.  I also find where console players got 16 weeks of some kind of horse event so why are we not getting an event every couple months or so? Your problem is you let various parts of this game stagnate untill you are forced to do something.  EACH lifeskill activity needs constant monitoring to keep players active in that respective skill.  This is the same thing for those who like to grind mobs and bosses.  ALL areas need to be kept current.  You push players to a point that they are just fed up with stagnant content.  

If land trading was revamped and properly done, horses would gain relevance. Heck, they could even make special trade horses. 

But hold on, thats too much effort, lets just add another gambling product to the pearl shop and call it a day.

Horse event = Imperial delivery event, which just means less horses in stables and on the market.

Players hoard horses waiting for horse events to mass imp deliver at once, making PA more money (one time sales) in stable slots.

The reason the horse market is dead is the free T9s and T10 they gave away, with the fact Fishing is the only AFK activity worth doing now. Horse value would need to be 5x to even 10x what it is to make it even close.

There's a horse event like every 6 weeks, and we have a chance to get another horse event with the current event that's going on..

in other words, we get too many horse events as it is.