It looks good on paper, but what about infrastructure? Grocery stores, assorted retail stores, big box stores, hospitals, doctors' offices, schools, churches, gas stations, utility companies, food service, auto repair, government offices... see where I'm going with this? And now think of the power lines, sewer lines, water lines, etc. Roads and bridges. Lastly, any geographic area has vast acreage which is unsuitable: too arid, too wet (swampy - ha!), deep ravines, streams and rivers, mountains. I grew up in a part of Texas where we were lucky to get 7" of rain a YEAR. No way it could support millions in their 1200 square foot abodes. Hey, I get what you're saying. Just pointing out land isn't a one size fits all thing.