On their listed average cost basis, they have spent $7,349,560 on building 860 kh's. That really is a drop in the bucket for them when you condsider that the lot for the Aspen, CO congregation is worth nearly $1 million. And if I recall correctly, a brother donated this lot.
When you get down to the nuts and bolts of the matter, the WTS probably gets much of its real estate for free. I can think of two kh locations where the land was donated. One is the current Alpine, CA kh up on Victoria Dr., and the other is the Silverthorne, CO kh on Rainbow Dr. Both locations are located in very expensive communities. Couple this with the fact that the WTS now owns this real estate, that is free money in the bank. The Alpine location is probably worth several hundred thousand and the Silverthorne one is probably the same. That's TWO! halls which are worth more than $1.5 million combined.
The WTS is loaded in real estate.