Locally there was a very strong push for EVERYBODY to ride the bus to the International convention. They discouraged driving to the stadium and were not as crazy about booking rooms through the society. My guess is that they are getting a cut of the bus fares that they organize. They even try to make whole congregations ride the same bus, even though family members would like to go together when from different congregations.
They said the parking situation was terrible, as they said for many other conventions. Yet there is no problem with parking for football games with twice the attendance. They must not get a kickback on the parking anymore.
Is it for control or money, or both?
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