In marketing & advertising we know that most people make decisions emotionally, but usually they have a logical argument to back up their emotional decision.
Example: Most people who buy a Rolex are not doing so for logical reasons. Ten thousand dollars for a watch? It was for emotional reasons, which include the perceived status attributed by others when they see him wearing it. BUT... Did you know it takes a whole year to make a Rolex? Mmmm, you're kidding? Wow... The finest sapphire crystal known to man? Nice... Waterproof to a hundred meters? Well then, it's obviously worth it. When showing it to friends they're not likely to admit the emotional motivation--but they will share all of the logical window dressing.
Yes, the emotional appeal to be a JW can be strong in the beginning. People are willing to give up family, holidays, birthdays--an amazing number of things--because of the allure of everlasting life. Further, when one begins to question, there are lots of emotional reasons why they dismiss these thoughts, which may include being cut off by all of their family and friends and no longer feeling that they have "The Truth."
But basing important decisions entirely on emotion only happens in very young children or adults with profound mental impairment. JWs present a few teachings when you start to study with them, that seem to have a well-developed argumentation. (Trinity, Hellfire, Immortality of the Soul...)
Then the propaganda begins. Beautiful paradise scenes. (Deer, cute children running in dress slacks, Koalas...) Reports of people embracing the religion all over the world. Reports of persecution that seem to confirm Jesus' comments that His people would in fact be persecuted. Experiences of how the pastor of another religion has "seen the light" and become a JW. We lived in an environment in which it would have been inconceivable that we didn't have "The Truth." Everyone said so...
So, emotional attachment? Yes. Along with certain logically appealing explanations and the synergy of group propaganda, the mind justifies what the heart desires.