A little bit off topic, but I had my dirtbike out yesterday for the first time in awhile, and I was actually thinking about dirtbikes vs. horses. You may argue they're not comparable, but I'd say they are because they are both things people buy mostly for the simple purpose of riding for entertainment. Anyway, from riding my dirtbike, the major advantage is that I just pull it out of the shed to use. I don't need to put gas in it while I'm not using it (comparing to feeding a horse), and my bike doesn't need pasture space when I store it and doesn't need a stall cleaned (I actually did have to clean up oil it leaked on the floor). I can also just whip the thing around and really get a quick glad of joy, and it's not too hard to ride. Not to mention it only costed me $800 to buy and does require maintenance but not a lot.
I've never owned a horse but from what I've heard they sound like they have a lot of advantages over dirtbikes too. I was whipping around in my neighbors field which I have permission to ride in, but take the bike on the road or anywhere you don't have permission to ride, expect the cops to be on you in 5 minutes. It's getting harder and harder with liability these days to find a place to ride. For the horses, there's a ton of places to ride. A lot of publicaly owned land allows horseback riding and there's horse trails and stuff. A lot of places let you use their land too. Also, a dirtbike is just a piece of metal, plastic and rubber; a horse seems to be more like a friend. On a horse you also don't have to worry about bugging the neighbors unless it poops on their yard. It's also more natural then a dirtbike. I've never rode a horse, but they also sound fun to ride.
It may sound like I'm implying I might get a horse, but trust me, it's not a consideration (yet at least). I was just comparing the two in my mind and thought I'd share. I just don't have the money, land, and time to get a horse right now. I would probably only end up getting one if I married a girl into horses (back to my original question haha).