When the Watchtower change from charging fo the literature to asking for a donation was when I stopped giving any money. What had happened was what I did before was the very first time I picked up anything at the literature department I paid for it out of my own pocket. Then afterward I would take the money I got from the householder from the publications to buy more literature.
But after they changed it from charging a set amount to the donation for the world wide work. There was an elder actually had the nerve to tell me that I need to pay for it out of my own pocket and then also give any money I got from the householder as well. This pissed me off, but I didn't say a word, just ok.
After that, I went in and ordered every single past bound volume and any other publication the Watchtower had at the time. I did not pay for it. I did that because I was giving the Watchtower a What For. Also at that time, I decided to stop asking for any kind of donation, so the Watchtower was actually losing money at my end.