We recently got an email list from a data leak. After a certain number of months this data is usable for soliciting (legally).
The list was of 2 million boat owners. We had an VA email blast them sending them to our land buy site.
It sounded cool but wasnt effective so we pulled the plug.
In the house buying world people wouls get lists from the post office of address change ans stop mail (for vacant houses) as well as the water/utilities shutoff list.