From Quotes: http://www.reexamine.org/quotes/donation_arrangement.htm
*** Awake! 1975 September 8 pp.24-26 Economic Woes Strike the Churches ***
Economic Woes Strike the Churches
...
During more than ninety-six years of publication, The Watchtower has constantly advocated the high principles of Jehovah God, as taught in the Bible. Many persons have been reading The Watchtower for decades. Logically, they have come to appreciate how it directs one's attention to the Bible. True, they, like everyone else, have their share of personal financial problems. But is it not a comfort for them to know that in the local congregation of Jehovah's witnesses they will never be tithed to pay out a percentage of their income? Nor will unscriptural money-raising schemes be imposed on them. It is at the Kingdom Hall that an unobtrusive contribution box is located for use by those who wish voluntarily to give money to support the work of the congregation. Donations mailed to the headquarters of the Watch Tower Society are also unsolicited and entirely voluntary.
So it appears that the woes that have come upon the churches are not simply the result of current economic problems. Does it not seem to be that they have lost the backing of the people because they no longer pursue spiritual riches, but, rather, material ones? Why give your support to them? Instead, associate with those who are enjoying real and lasting spiritual good.
(emphasis added)