Meowy Catkin
Meow!
ETA, why do you think professional yards aren't full up with twenty-five year old field ornaments?
It's funny that you should mention that, as the one person I know who very strongly believes in giving her retired horses a proper retirement is an Event rider. She does have her own yard though, so she has the facilities to do it.
The owner who has no land and can only afford to keep one horse at livery, will find it much harder to keep a retired horse. They have to decide between keeping that one or sell/loan/pts and get another ridable horse.
I personally would keep and give the horse a good retirement if I could and they were healthy enough.