Even if it is not groundbreaking, people need to learn it somewhere. I've learned a ton from YC posts. Maybe they are things that people running businesses already know, but that is not me. I may look at an application and say it is not innovative technology, but if they are solving someone's problem and making money it is hard to argue with it. YC is definitely educating people who don't know these things and in that sense, the information is very insightful.