Finkelstein Kingdom Halls are actually (brainwashing) training centers for their own door to door sales representatives.
This is true. The Watchtower Society's have based their set up on a standard USA cold sales company. After I left Jehovah's Witnesses, many years ago, I had a go at door-to-door sales with a large UK double-glazing company. They had meetings, back-calls, literature placement, and a field-overseer and local team leader. The dress code was strict - a sit and tie at all times. I couldn’t believe how similar the set up was to the Watchtower Society.
This set up worked when the aim was literature sales. Now they give the stuff away, there is no longer any point it. They may as well the organization from one office. All literature is downloaded from their website. Of 7 million Jehovah's Witnesses donated just $10 a year they would have $70 million a year just to run the office. They could do a deal with a book company to produce a new book each year and deliver to congregations. The Society would get a royalty on sales.