JWs do not follow the first century model. First century christians followed the grass-roots, local congregation-focused model. JWs follow the hierarchical, global organization-focused model of the major churches of christendom.
First century christians did not have any hierachical organization above the local congregation. Above the local congregation was Jesus acting through holy spirit and the angels. This was the invisible "organization" overseeing the "global" preaching work in the first century. There was no earthly international headquarters demanding monetary contributions from local congregations. There was no plethora of policies and procedures and paperwork coming from an international headquarters and taxing the valuable time of the local elders. The elders had lots of free time to be with their families and to tend to the actual practical and spiritual needs of christians in the local congregation. There was no great expenses resulting from the construction and maintenance of places of worship (kingdom halls). They met in homes. First century christians kept a "simple eye". They slaved for one master - God. Their service and loyalty was never divided between serving God and serving a demanding organization.
By contrast, JWs have followed the major churches of christendom and created a showy, expensive, hierarchical beast of an organization that competes against God for the loyalty and service of the JWs. Every month they have to remit a substantive sum of the congregation's monetary contributions to feed the beast. The beast meddles in, and seeks to micro-manage the spiritual activities of the members of the local congregations, demanding that they gave monthly reports detailing how much hours the preached, how much literature they placed, etc. The beast is expensive to maintain and is greedy for money. The beast issues a plethora of guidelines and paperwork to distract the local elders away from their family obligations and seeing to the actual practical needs of the brothers in the local congregations. The beast has turned all the congregations into cold, paper-pushing, policy-stickling, red-tape constricted factories geared more toward furthering the interests of the beast than the actual welfare of the members in the congregations. The beast has local congregations engaging in the expensive and time-consuming act of constructing houses of worship - something that never entered the minds of 1st century christians, and which Jesus implicitly showed to be unnecessary, for "niether in this place or that place will you people worship the father" and "where ever two or three are gathered in my name, there I am in their midst" and again "keep your eye simple" and "stop storing up treasures on earth". The beast is greedy, the beast is materialistic, the beast is arrogant, the beast is callous, the beast is self-seeking and enages in all manner of unrighteousness deceptions, legal maneuverings and scripture twisting in its efforts to seek its own interests.