A person's estate =/= only real estate
Misread that, but as I already noted, the value of money would also plummet, and society would probably at least temporarily devolve into anarchy, through which you probably wouldn't be able to hold your claim on any part of their estate. So the correction doesn't really bear on any of the comment's points.
http://eternal-earthbound-pets.com/Home_Page.html
Providing assurance that pets will be provided for in the event of Rapture.
Having thought it over, I'm OK with the ethics of this service.