I heard from a reliable source that a one-day assembly in Arizona last weekend had a "cost" to the Publishers of $17,000.
Predictably, the Elders were nice enough to obligate the attendees to a $6,000 donation to WT before the assembly "costs" (i.e. "rent"/extortion) were even met. $11,000 rent plus $6000 in extra "donations". A nice little payday for WT.