But there is a lot to think about when you don't board. The payments on a house with the land, the barn, etc. is going to be a lot higher than a house in a subdivision. There is also you having to buy a truck to haul hay if you don't have one already, not to mention the trailer. IMO, if you keep your horses at home, you kind of need these things. Unless you literally never trailer, and KNOW you can get someone out there for emergencies. Both of those things cost money. Then there is the hay, the shots, the grain, the medications, the barn accessories, you have to buy all that stuff. So yes, keeping at home is very expensive.
But again, it's so, so worth it. Saddling up and riding at the blink of an eye, not having to speak to anyone, no BO to deal with, no contracts, no boarders ... nobody but you and your horses. Also, I adore doing all the barn chores. Keeping the place spick and span, mucking, feeding, giving hay... The list goes on and on.
It's personal preference, sure, but if you can afford home staying, I recommend it.