You know it's interesting that scripture clearly says in 1 Timothy 5:8 that "anyone [who] who does not provide for those who are his own ....... has disowned the faith and is worse than a person without faith."
Scripture does say to put the Kingdom first and all other things will be provided. So the question begs, if being a zealous Witness gets you only as far as the Goodwill for the basics, then obviously, somehow their "worship" and putting the Kingdom first as a Witness, is not being blessed by God. Otherwise, Malachi 3:10 would apply where it says in part, "Bring the entire tithe into the storehouse, so that there may be food in my house; and test me out, please in this regard" .... "to see whether I will not open to you the floodgates of the heavens and pour out on you a blessing until there is nothing lacking."
Bottom line, God does not approve of their worship when they are putting the GB first, who claim to speak for God, and His Son a distant, distant second. Again Christ says, " I am the bread of life". I don't know but it seems pretty clear to me.