Look at what the scans below say. That publishers spend considerable gas and insurance and time to go from door to door to place the odd magazine or book. In reality the JW publisher is footing the whole bill and then some.
The JW publisher has to spend about 100 dollars per month for every dollar from donations received for literature sold at the door.. I know this to be true as I used to flog books at the door. I think that I only sold 3 books in a 2 year period so the 100 dollar amount is actually a low figure.
The WTS could switch to a TV or internet ministry but then the poor dubbies would not have anything to do. It is dubbies who directly finance the WTS through donations wills trusts etc. Take away the dubbies and you take away a major source of WTS income
http://www.bibletopics.com/biblestudy/images/84c.gif
http://www.bibletopics.com/biblestudy/images/84d.gif
I 'm so glad that I 'm out of dubland and my car is lasting longer these days as I don't do the stop and go driving that door to door work requires.