My parents were Jehovah’s Witnesses and I was also until about 1991 or so. They are only doing what is required of them to do to remain in good standing, and what they believe the Creator expects of them. They also do it because they truly believe that this system of things is ending and many will lose their lives forever. So if you care for your fellow man, that is a pretty strong motivation. They have no ill intent and make absolutely no money doing their ministry work, in fact it costs them money and time to do it. I have my issues with their beliefs, but not their motivations.