The $20k he mentioned is just for the course hardware. Not for the land.
With 160 acres, assuming it is land acreage, you could build probably 4 or 5 championship caliber gems, or 6-8 standard size courses. Most existing courses occupy an acre per hole if not less.
i couldnt agree with you more. most times you dont have to but the land, you can get the land from a public property as well. and i have never heard of a course taking up that much space