People do what other people do. Some brilliant soul one day decided a little green grass would look nice in the front yard so he made it happen. A neighbor decided to plant some grass in his front yard. Now all the neighborhood have grass growing in their front yards. It requires nothing but work. It keeps growing so we need to mow it down, so once a week we mow it down. If you live where it doesn't rain much you need to invest in some water hoses. Someone needs to move those water hoses around so all the grass gets watered. The lawn mower needs to be replaced with a riding one, heaven forbid if we have to walk behind one of those things. Now we are getting a lot of money invested in this yard with the green grass, but what would the neighbors think if we had a bunch of rocks dumped in the yard and spread out so it covers all the green grass. Think of the money we save. Well, if they don't like it they can lump it. Here comes the rock
The neighbors laugh and gossip about it for awhile, then they begin to envy this neighbor that sits on front porch drinking lemonade while they are mowing their grass. Now we are seeing more and more of the rock covered yards. People never change much.