This is obviously a very small market for NVIDIA right now with most users not having the appropriate 3D glasses, which can easily cost over $100 per pair, or the displays that are also significantly more expensive than normal LCD panels. The software/application also needs to support this 3D technology.
NVIDIA has supported 3D Vision for a number of months now in their proprietary Linux driver, meanwhile they don't support Optimus Technology on Linux or other features that are actually used by a greater number of customers.
Yesterday, NVIDIA even put out a new binary Linux driver release where it's sole official change is a 3D Vision bug-fix.
Updated the NVIDIA X driver to not update mode timings for G-Sync compatibility when NVIDIA 3D Vision or NVIDIA 3D VisionPro is enabled along with a G-Sync device.
This is the only official change in their new 260.19.44 driver release, while all work right now has been focused upon their soon-to-be-released 270.xx series.
So why is NVIDIA focusing so much on 3D Vision / 3D Vision Pro under Linux? It's very likely because of an enterprise customer or a distribution/purchasing deal that is about to take place. Similar to how multi-card SLI (Scalable Link Interface) came around for Linux back in 2006 likely because HP wanted it for some of their workstation systems at the time. But who exactly is behind this 3D Vision Linux focus is a mystery for now.