So when you notice Kingdom Halls being sold, are you sure the number of congregations isn’t actually staying the same, or even increasing?
That's definitely the case sometimes when congregations are being forced to move and share another Hall after their Hall is sold. It makes sense to utilize the Hall for 2 or 3 congregations when the travel distance is still reasonable for everyone in all the congregations.
But there are many congregations being "shut down" or "closed" (ie, for low attendance, lack of leadership) and the publishers there are directed to attend a nearby congregation. That has happened with at least 6 congregations that use our assembly hall. Congregation shut down, publishers reassigned to one or more other existing nearby congregations, and the Hall sold (if they were the only congregation using it). It was small congregations with low attendance and probably low contributions (mostly rural areas) that were merged with other nearby congregations.