Do you like to wax philosophic? 
Of course!How cool is it that the oldest known example was from 4500 BC?
That old. That blows my mind. And who was even being a philosopher back then?
Lots of people! One famous one was from the Celtic culture.
and this person was popular? did they make a lot of money?
Somewhat! But not to the standards that we live up to today.
I didn't realize. So can you get rich with Philosophy today? 
You can! It all depends on your location too. United States vs. Europe, makes a difference.
That is pretty interesting. And which country would make the most?
Anywhere without modern architecture, as that was recently questioned by those believing in postmodernism.