The governing body and branch are not the ones responsible for the Kingdom Halls. They sanction the build but then the congregation is on its own to pay the loan and make its own money. They did recently make the change that all extra funds should be sent to the branch tho.
Its to possible you could be on to something. But I don't see how this could happen without local elders knowing, congregats knowing, etc. This would create a sticky situation for the times when a meeting is for gay rights or abortion because while the branch may be amoral the individuals aren't necessarily. So how many of the rank and file are they willing to lose? I don't know if they'd make that sacrifice, and they'd have to to avoid discimination lawsuits as someone else pointed out.
but, maybe they are thinking about that and will grab as much as they can before that happens.