Why is it so hard to find a good used Suburban 2500

Decent mileage was hard to find since mine is a daily driver also. I did find an 09 with less than 30 k miles this past spring. Price was above what the OP was looking at. There was a handful of them that hit the market close together from a government use auction. Mine was from the State Department (found an old registration card in it). Good ones are hard to find