Another key element is that orphaned lists were created in the 90s to 00s before dealerships considered the difference between a marketing qualified lead and a sales qualified lead. So everyone was just considered a sales qualified lead and blasted.
As a prior customer they are in the middle so you can be personal but you can't just start selling a car or ask to come in the dealership without first giving them a reason why. From a sales person's perspective they want to talk to warm SQLs not cold MQLs. Alex already hit on tactics for this, audience based campaigns really shine here and after the customer identifies themselves they pass into SQL and the new sales person can roll.