PS. I think my Fox Trotter is a good example. She's a nice horse and registered, but nothing noteworthy. She's been passed from home to home, having babies as she's went, to the tune of 10 foals. I finally bought her for a song from a guy that said he was sending her to auction. Why? Why would someone who trail rides buy an ex-broodmare? Because she is sweet, the right price, and above all TRAINED.
I would hate to think where all the ex-broodies with no training end up when their broodmare days are over.
But for my mare, because someone somewhere along the line took the time to saddle break her, she found (what I would like to think) is a good home that loves her and plans to keep her until the end. I really think training (along with good disposition and soundness) can really be a horse's saving grace.
And for heavens sake, if all you want is a pasture pet (which is GREAT by the way!) consider adopting a horse that may not get a home otherwise due to soundness or other defect. You will be saving a life and the horse will do just as good a job mowing the grass.
Heck, if I ever come into fortune, I will open an old-horse retirement farm. They deserve a beautiful place to live out their lives.