The lifestyle of the GB is a billionaire's lifestyle, perhaps even better. Take a look at any cult leader and their lifestyle. They are in want of nothing.
Perhaps the GB members do not spend much time on yachts or in 20,000 square foot mansions, but they do have assistants to do EVERYTHING for them. When they travel, they travel with an entourage. Permanent bag boy, waiter, attendant. Typically a helper couple is assigned to fly with the GB couple wherever they go. They are there for their "safety and comfort", but anyone can see they end up doing the GB couple's "bidding".
Imagine handpicked helpers/assistants that surround the GB. These folks believe they are hanging around a guy that GOD whispers to.
When I think about it, I don't think even Bill Gates can his hired staff of assistants to do things with the zeal that any JW would do for a GB member.
They don't personally possess a billion dollars each, but they don't need to.