I always get the listing home warranties for my sellers if they don't already have one. I think most of my sellers like the idea, but they don't really realize the benefit until something happens. The listing coverage is not as generous as a buyers home warranty policy but it's better than none.
Just had to use one for my seller's home. The furnace had a crack and would cost $3500 to replace (which is needed). Although the warranty company only allows for $500 as a listing coverage, it's $500 better for my sellers;; and the cost is very low. I personally think it's worth it.