My draft gelding is the anyone can ride/drive type, and I’ve had no problem letting other people ride or drive him over the years. He’s been the demo horse for 4-H clinics, the kids have borrowed him for shows, and he spent some time in a therapy program.
My mare, on the other hand, is hot and extremely sensitive. She’s awesome for a really good dressage rider, and it’s was fun to see my instructor get on her, but there are only a very few people I’d consider letting ride. If you don’t do things correctly, she’ll just race around like a lunatic with her head in the air. And since I got her after her previous owner fell off her and broke her back, the liability would be huge if I put someone else on a “known to be dangerous” horse. Not cool. :no:
Other than that, my two year old is too young, and once she is old enough, I’d like things to be consistant and correct while she’s learning, so I’ll probably limit who gets on her to my trainer and myself. And the old babysitter mare is retired, so I don’t even get on her.
And in the past, I owned a gelding with HYPP. He was managed very carefully, and I still rode him. He was fearless on the trail, and a blast to ride as long as you knew what to do with him. He looked easy, but he was potentially a ticking timebomb. So no one else on that horse, either.
So sometimes people are selfish, but sometimes we don’t want to have to clean up other people’s mistakes, or subject a horse to what may be an unpleasant experience for them, sometimes there’s a liability concern, and sometimes we genuinely want to prevent other riders from being injured on our difficult horses. Just because the owner makes it look easy, doesn’t mean it is.