Attempting to sell a horse is not "dumping" it even if the ad is horribly pathetic. Dumping a horse is opening the gate and shooing it out.
You have no idea what these people are going through. I only have one horse and am struggling to buy the hay he needs. I can guarantee you that if I had to choose between feeding him and feeding my kids that I too would be writing up a sale ad and if I got desperate enough, he'd go to auction. I won't let my kids go hungry so I can own a "pet".
I'm with you SR... I have lots and lots and lots of acreage but dead grass doesn't feed horses, so I certainly won't be bringing any more home.