Accounts doesn't get deleted if not someone deletes the account manually.
You lose your assets if you have not used them within 3 months without an warning what so ever if your an "active player" or not.
Asking admins to sell an property due "inactive" owner is the worst you can do. We do regularly check for inactive used property's and vehicles so the only thing players have to focus on is if and object is sold and no one owns it, you can buy it. If an object is owned by someone you cannot buy it, SIMPLE!.