With most of the new baptism s being born in theres no need for new seats and the so called need for kh is a big fat lie. I wonder why the number of ones leaving dropped way off in 2009 and hasn't gone back up much since then?
Baptisms of born-ins still have to come from somewhere - even if the number is solely indicative of the birth-rate of JWs, they still need to split congregations to make room as families grow.
With the 1500 or so new congregations, they'd only need about 300 KHs assuming they can get full utilization of them. Of course, this also assumes they were already at capacity, which probably isn't the case. I guess there is probably some additional need for new KHs on top of that due to the churn they're experiencing - there's a lot of growth in developing countries, and none in the 1st world (any growth there is almost certainly from immigrants). This actually compliments their business model quite handily because it means that they actually do need to build more KHs. What they don't mention is that they're pocketing the money from the KHs sold where there's decline, but they're not spending that money to build the new ones where they're needed.
Regardless, the need for new KHs isn't anything near what you get the impression it is from all the letters and articles that come out of them. The need for donations for these new builds is even more misrepresented.