Interesting. I'm one of those nuts that would buy a monochrome camera.
---------- Post added 07-01-14 at 11:22 ----------
Originally posted by alexcox
I already have a monochrome Pentax camera. It cost me approx. $500.
It's a K-01 body (which cost less than $300) with a 720 nm IR filter (installed for $200). This produces monochrome images (with an occasional tinge of colour in the sky or with certain light sources). Of course, they are infrared and so the leaves are white, not green. But the image is extremely sharp and - given that the Monochrom costs $8000 - the camera is something of a bargain.
That's good and well, but correct me if I'm wrong, you still have the same issue called out in the color/monochrome sensor comparison, just that your limiting what light hits the sensor. The pixel combining still takes place, whereas in a true monochrome sensor it doesn't.