I'm happy to say that I've never donated a penny to the Watchtower even when i was in. I couldn't afford to! It cost me £80 a month in taxi's to the meetings.
I remember giving a talk about giving to Jehovah. I concluded that one of the most valuable things a person has is time. And brought out that we can donate time to the org in preaching, meeting attendance and study. I didn't mention money because at the time i sincerely believed what out CO had told us, that the org dont worry about money.
I was reprimanded for that by the elders.