Some people have more kids to get more benefits from the government, not to provide a better life for the kids. But generally speaking, I think a lot parents believe that if they provide the basics (food, shelter, love, etc.), that's enough. I use the term basics loosely since people have different standards. Some parents are more intentional about providing a better life, such as trying to live in the right school district, exposing kids to different hobbies and experiences, being more involved on other aspects, etc. For example, most of the MLB players from the U.S. went to high schools with good baseball/sports programs; a lot of parents were intentional about putting their kids in these schools if they believed the kid had talent.