Pasture, stable, feed. There are ways to have a horse cheaply. (Maybe. It occors to me that the people who are really into it board other horses, or give lessons,and still need outside jobs.) I can’t figure out how, without moving, because I live in a city. When I was a kid, I lived in a town, and people did have horses in their back yards. I had a horse that I kept in someone else’s back yard for cheap. Even then, I realized it was cheap. I still had to feed my horses hay, lots of it in the winter, and a high-calorie feed mix to replace all the times the horse couldn’t be grazing because I was riding her. (They eat pretty much all the time, and very slowly. You don’t want them to eat fast.)
Now that I’m in a city, the people I know who have horses are either rich, or they live way, way out of the city. Usually both! Ten years ago I could walk my dog past several horses within 10 minutes*, and now we have to walk for at last half an hour to encounter a horse. A woman I knew, who gave lessons, just moved her outfit from the Denver suburbs to Evergreen. (She had a very expensive piece of real estate in a Denver suburb, and she’s leasing it out to another couple of horses, but I think there was some tax thing about her dressage classes that made Evergreen a better alternative.)
The other big thing is the farrier/vet. Horses need a lot of foot care. When I was a kid, it was $10 a hoof to shoe the horse, but that’s a lot more expensive in a city. Which makes sense; in my small town, the farrier was only a five-minute drive away and perfectly willing to come over and replace one shoe for $10, no trip charge. They don’t do that in a city. but the farrier is probably at least 40 miles away now.
I also want to note that, if you only ride your horse once a week, it’s not going to be the best horse. So there is the time thing. You spend half an hour grooming and tacking up, 20 minutes on groundwork (you can spend more time on this–really a lot of time), an hour to ride, another 30 minutes to clean the horse and the tack, and that’s not even counting the drive. When I took polo classes, I spent about three hours driving/grooming/wrapping for every hour I spent playing. If it takes 10,000 hours to get good at something, I figured at that rate it would take me 20 years, since I only had 4-hour blocks of time on the weekend, and other things to do on the weekend, as well. Of course part of the cost of this was that somebody else rode that horse every other day of the week to keep his skills sharp.
*But this place, which is only a couple of blocks away, is not a place I would consider keeping a horse. Less than an acre, no pasture to speak of, surrounded by junk, really close to a highway, and no place to ride unless you put the horse in a trailer and drove somewhere. You wouldn’t have to drive that far, but you definitely couldn’t ride there. And it may not even be legal. I think that horse that lived here was grandfathered in. And now it’s gone.