Trailer Parts House When You Buy A House, Why Do You Have To Buy All The Dirt?

When you buy a house, why do you have to buy all the dirt? - trailer parts house

I am a man trailers, double wide, which is not bad. I bought my last one for 28 acres. My wife and my girlfriend wants me to have a house. But they cost a lot. So I wonder how on earth do I need? Perhaps the first foot or two, but why should I be paying more. I only need the top of parking my car and a pile of garbage. Please promise to bury them nothing more than a foot or two can save money?