I have to disagree.. Not everyone has enough time to learn "ready" systems either, they can get pretty overwhelming. When I decide to build instead of buy, it's mostly because I don't believe in the design of the product that is favored by thousand people with reason being "it just sounds cool".
This works great until you hire a second person who now has to figure out how your system works from the documentation you wrote, rather than the documentation and blogposts on the internet written by the thousands of people who thought the other thing was cool.
