I vaguely remember when crop circles first appeared and made news, there were journalists saying they couldn't possibly be done by people. Then a year or so later, I saw a news item or documentary where some people revealed that they were doing it, and gave a demonstration of the boards and surveying technique used.
It should have all died down there, but I guess it is much more fun to believe aliens were involved, than a few geezers from the local pub.
I suppose there is a parallel to the early days of Watchtower. It was probably more fun to believe Russell's amateurish numerology and pyramidology (complete with obvious mistakes such as the date for the fall of Jerusalem, no zero AD etc) than see him as some guy making money selling a book series.