"Fully" seems to be doing a helluva lot of heavy lifting in this piece. Does anyone think that they mean anything other than "making money", as they quickly segue into talking about entrepreneurship and founding businesses?
I'm happy to concede that if you don't tell anyone about the stuff you do, no one will know. But I am not willing to concede that you only "fully" benefit from your work if you sell it. Nor am I willing to concede that work only has value if sold. I'm also not entirely certain the author is pushing those views. Still, something about this piece doesn't sit well with me.
Human endeavors have value beyond the monetary.