WT leadership were not acting according to the propaganda they were disseminating in 1975
Half Banana,
That's were a distinction needs to be made between the individual leaders and the WT org as an entity.
For a honest JW, all individuals, including the leaders in the WT working in Bethel were spiritual people who left everything behind to work in Bethel. What would have been more appropriate than to be found working in the house of God while the end was coming? Since you spoke about JW leaders looking for profits, I asked - Do you have any information that the individual leaders and their families during the 1975 era made personal wealth and gains while individual JW's outside Bethel were selling their belongings?
Regarding the investments made in 1975, honest JW's thought that Jehovah was directing the organization, and all decisions, including property investments were made by the organization for furthering Kingdom interests. JW's back then, and even now believe that they would be continuing their education work in paradise and possibly Jehovah will use some of their existing properties in the new world.
And that's the main reason there was no mass exodus in 1975, like the one in 1914 and afterwards. May be people joining the JW's are mentally prepared for such doomsday debacles, since 1975 was not their first prediction.