As to the GB being paid $100,000, never heard that in the 55 years I was personally in and in 4 generations of jws back to 1920.
I too doubt they are "paid" much, little more than the Bethel allowance. However I've heard many Witnesses talk about giving money to COs and DOs by slipping money into their coat pockets, sending it to them, and in other ways. No doubt the GB members receive such gifts too. Who knows how much?
In some places they are practically worshipped. Would they receive as much as $100,000 per year, even in their most prosperous year? Probably no way to know for sure.