It is a little bit of product placement.
http://indicetj.com/pdf/apostila/figura100.pdf
The publications constantly flog its brand, pushing people to obtain and read its literature as a cure for virtually any problem. This includes many not too subtle pictures of people placing literature. Then there are the many sideline businesses like Circuit Leasing that help fill the Watchtower coffers. It is the next logical step to sell product placement spots to outside corporations, with carefully selected products that do not tarnish a "wholesome" image. Nothing to see here folks, just another corporation seeking to expand its market opportunities to maintain revenue. The "religion" sold is merely another of its products.