In our congregation a letter was read out from the Britain branch saying how each congregations contribution was helping out with the work etc. They didn't specifically ask members to donate, but they did thank everyone for their contributions.
So it's a bit like a child (who takes, but never gives) staring at another childs sweets saying she appreciated the sweets she was given in the past, but not directly asking for sweets. Yet the child with the sweets feels an obligation to give some to the child determined to get them..