No one should ever require money for delivering Allah's messages. Work for Allah has rewards other than this world. Islam is for everyone, Muslims and non-Muslims alike. If anyone should demand money for themselves for Allah's messages they will surely lose. Teachers of Allah's message should still seek advice from Allah how they should survive, not from money demanded from those learning. If Allah is willing there will be those with enough money to give from their hearts willingly.
I was in the mosque talking with some young men. I was asked what I do for a living. I told them that I do web design and took out my wallet to offer them my card when Allah touched my heart and reminded me that it was wrong to do anything related to business in his house. I apologized to the young men and told them I could not give them my card in the mosque and put my wallet back in my pocket. I was surprised when I came back to the mosque at Asar to find 3 washing machine salesmen inside the fence of the mosque at the entrance to the doorway. They were set up with the washing machine to display to the women coming at four for their daily Quran reading. Allah has showed me how one thing could lead to another until the house of worship is filled with traders looking for buyers. I was also reminded of my teaching from the Bible of how "Isa-Jesus" the messenger of Allah went into the house of Allah and made all the people there doing business leave.