Most of the best literature in the English language was written before modern IP law was even a thing. There's very little good literature written by authors primarily motivated by money.
I can only think of one writer off hand who wasn’t a wealthy landowner, although it is a particularly notable example; that of William Shakespeare.
Shakespeare wasn’t poor (his parents seem to be of upper middle class standing), he was able to get a basic (but not a university) education and then pursue an acting career (with perhaps a side hustle as a teacher). Whatever the case he certainly wasn’t independently wealthy before he started writing, he needed to earn a living.
He did seem to be in it for the money (and fame) since he wasn’t just a writer he was an actor, theatre owner, and something of a celebrity, and he did make enough money to become a wealthy landowner by the time he died.
> best literature
What does that even mean?
But there is also some consensus. For music it would be Beethoven, Mozart, the Beatles, etc.
For literature it would include Tolstoy, Shakespeare, Cervantes, Dickens, Austen, Tolkien, and many more. I would bet it will eventually include Stephen King but it's too early to make that call now.
Not to mention, many people would disregard your answer for putting Stephen King (and Tolkien, to a lesser extent) in the same sentence as Tolstoy and Shakespeare.
There is no "better" anything when we talk about culture. No consensus, etc. There are just opinions.