It will make you, at best, a keen observer. Some people can make a living writing books about their observations and assertions formed from them. Most, however, will not.

How much extra value does one more person writing about Locke or Rawles really give society? It depends entirely on how many we already have.

The people doing history, for example, are the grad students and faculty who dig into archives and write books. They, largely, are shit on by society and are working in a field that pays virtually all of them like crap.

And they don't repeat themselves. The Nth person to write a book on Topic X isn't just saying what has already been said. They are in dialog with all of the other authors. They reinterpret and recast the history. They view it through different methods or they create new methods that others will use in the future.

For commercial artists- designers and such for companies- it is usually a good living.