The new NWT editions (the greys) with silver edging are straight from Bethel.
If you've seen someone with one of these greys then that tells you they're well connected at Bethel.
There are ... ehem... pictures of Guy Pierce with one of the greys at Bro Ferguson's Facebook page.
nuf said about where you can get photo proof if you want to search for it.
So... yeah, the plasticky editions turned out to cost cheaper to produce and were treated like the cheap binding issues they were, the publishers didn't donate enough to cover their cost in producing them. A lot of these are placed without much thought about requesting a donation.
So they saved some money in producing them as compared to the cardboard hard cover with leather grain imprinted on paper, of course the one that really costs a lot to produce are the gold edged red/maroon and black pigskin leather ones, which are special request items.
The leather on the greys is supple and smooth. The Bible itself is thicker since it includes the indexes which appear in the reference Bible. The text in these editions was the same as the one we can get now minus the [brackets].
That's my recollection in having had some of these to thumb through.