> 2: Such locations may not always be torn down because of a monument protection status. A tried and true tactic to get around this without actually restoring the place is to simply let time and the elements do their work until the place can no longer even be restored. This is a long term investment plan.

Protection laws that don't pay for the protection have this unintended side effect. Another example in the US is the Endangered Species Act: if you know your property might have such species you have the incentive to prevent anyone from surveying it, and to bulldoze it before anyone does.