When the TitanX arrived it was flying off the shelves until the GTX 980 Ti turned up.
There is a good market for very high end cards.
Yep that was what I believed to be the case. Looking at some articles suggesting demand for the Titan x when released was much greater then anticipated, more so compared with the original Titan which lead me to believe the market while small is growing rather then retracting for the high end market. No doubt the 980Ti only added to this trend but cannot find anything concrete so was curious as to the information by Simon suggesting high end cards do not sell as well any more.