I agree with Mary: you won't see extravagance in the FDS and other top level members.
WTS is 100% tax dodge. So perception is everything. The last flamboyant president was Rutherford in the good ol' days.
Since then what you have is from Circuit Overseer, District Overseer (in the field) and especially at management level at headquarters, a completely funded life including all the perks (free cars, health care, equipment, flights, etc.) all paid for directly or indirectly by the R&F.
Circuit Overseers used to have to carpet-bag from congregation to congregation, staying in JW homes. Then the local circuits started funding RVs and caravans. Now (in the US/Europe) most circuits have a dedicated apartment (at a KH or Assembly Hall) for the CO/DO (at no charge of course). There is a free car (in the US its usually a large Buick, fleet purchased by headquarters). The quality of life of CO/DO's has greatly improved in the last 20 years.
To some that is luxurious life. Play the game and you're on the dole for life. Not bad.