Simply put, to accomplish our ministry fully, we must have as full a share as possible in the preaching and teaching work.
They say they want you to be effective in your ministry but I'm convinced that the GB aren't concerned in the slightest, with the closeness of the end or getting the word out. Imagine what would happen if a wealthy JW or a group of JW's wanted to "fully accomplish" their ministry by purchasing television air time to give the same presentation they would have in used the door to door ministry. They'd say they were running past Jehovah's celestial chariot and not humbly following the direction of the "Slave" who in reality want to keep their members on a never ending treadmill of busy work.