Here is a download link to The Finished Mystery 1918 edition
http://www.sendspace.com/file/up0oes
This site has many of Rutherford's books
Anyway, how long can a church keep its people on edge for the end of the world, when it doesn't seem to happen?
As long as people are willing to donate enough money to keep it profitable. Why stop selling if people are still buying enough to keep the the cash flowing?