Installation involves a wet/diamond saw to cut the stone, which I viewed in action on granite at our supplier. I never saw what they used to get the rounded edges and bullnoses on the stuff. Unless you have equipment like this, and the skill to use it (they had to put in two holes for the sink, too), "tremendous mark up" is all a matter of opinion. They set up in our garage to do the final cutting and trying before putting it in, and any mistakes on their part would have been on them. They didn't make any errors on ours, but I imagine they exist, and they all go into overhead. The granite for our kitchen was $6500, and after 10 years of living with it I believe it was more than worth what we paid.
This stuff is expensive enough that I imagine the best shot at getting small pieces is chunks like they cut out for our sinks. Personally, I'd go with tile....
(NB: We found that granite was no more expensive than the synthetics like Corian, and far more resistant to damage.)