You are talking about a Piper worth a 200.000, donated by a rich brother to make preaching easier in Alaska.
GB members do live humble it is like Richard said, every member has a humble room in Patterson (I staid for two week in Barr's room, old fashioned cheap furniture) and they are guest-rooms when they are not there.
That some have nice rooms or had, in Brooklyn had to do with seniority.
I don't know why some here just don't believe people that have lived and worked at branches, missionary-homes and the HQ. Is it so difficult to accept that it is not about money nor easy life? Who would like to be in the shoes of any GB member at their ages? Getting up every single day at 6, and travelling around the world?