I think the people who join jws now, are the same people who get involved with lots of "get rick" quick stuff and pyrmid schmees, and even selling vitamins, . u can turn anything into a religion. health care, therapy, anything can become a religion. It is these people, people who are searching for an answer to "who am I" and "why am i here" idealistic people, who often fall for jws.
If i were approached as an adult, i would have never joined jws. especially now that there is the internet, were u can research groups.
now many years ago, as i am a third generation quasi jw, people did join b/c of doctrianl issures. it was very different, when my grandfather joiined. now they don't sell doctrinal issures so much, but 'better way of life" issures. duh, mormans have a nice way of life. What makes jws so special.