Just to balance out this line of answers,
The business model that Realty Trac uses is that there are people, potential investors, that want to get a "deal" Some of the same people that post those signs by the freeway on ramps "We Buy Houses" use Realty Trac as a way to find out when a homeowner is in trouble.
Taking the optimistic side here, they can go to someone that has had a Notice of Default issued, and perhaps "save them" by buying the property, sometimes with cash, closing quickly, and the owner avoids a foreclosure.
Realty Trac offers monthly subscriptions where you can get more information on these homes. They definitely have a niche market.