College Towns Escape the Subprime Pain. Why?

Ford Fessendon, in The New York Times, provides us with one more reason why we love living in college towns:

As the inner cities, along with much of Florida and the interior of California, face the prospect of a foreclosure meltdown, American college towns appear to be islands of stability.
The list of metropolitan areas with the smallest percentage of high-cost home loans is dominated by small cities with big colleges, including Ithaca, N.Y.; Iowa City; Madison, Wis.; Morgantown, W.V.; and State College, Pa.