Publication of written texts involving the dhamma

I have bought in my life many works written by the Dalai Lama. I know that as a monk, he forgoes material possessions. Yet, I recognize money is still being made with those texts, from the editors and publishers and so on. Am I to understand that it would only be wrong to sell such texts if the author gained money directly? What considerations are involved in the sale and publication of dhamma-related works?