When you stay in one job for a quarter century as Comic (and Column) Confessional author Dave Astor did, it helps to have good reasons for doing so. Here are a few: Heloise, Arianna Huffington, Ann Landers, Abigail Van Buren, David Broder, Ellen Goodman, George Will, Erma Bombeck, Dave Barry, Art Buchwald, Walter Cronkite, Hillary…