Even though learning Torah is the most important of all commandments (as it says in the mishna in Peah  ת''ת כנגד כולם  "Learning  Torah weighs more that all the commandments,'') still I do not think that this value remains if one learns for money. That is to say I think the entire value of the mitzvah disappears when one gets paid to learn. This opinion you can see in Pirkei Avot (Chapters of the Fathers) chapter four where the Rambam explains what the mishna says about not making Torah into a shovel to dig with that if one does so he takes his life from the world and the Rambam there in his commentary explains: ''from the world i.e., the world to come.''

Serving God is not a money making profession and those that claim that it is are enemies of God and enemies of Torah for its own sake.  [I  mean to say that no matter what, you need to be sure of DIVINE SIMPLICITY--that God does not share of any traits that any human can even imagine. He is totally ''other'' and not a composite.