I don't know - when a $290 Radeon can drive 6 monitors per card (with enough acceleration to draw basic 3D on each), is there really a place for Matrox any more? The card you linked is $1800.
I know either is a small fraction of the cost of the overall device, but you'd still want some kind of benefit for the price increase.
While they may not directly need the 3D acceleration it may be being used to their advantage still, that was one of my questions but they said that lower end cards were resulting in stuttering. It looked to me like it was all stuff in web browsers so they might be using newer chrome/ie and the like with hardware accelerated rendering.
Edit: whoops, didn't notice it was $$$$.