This system can inform as to what you sold, to whom it was sold and the date of that sell.
Imagine having this information easily available when a previous buyer calls.
Imagine having this information available when you want to reach out to a previous buyer, either by phone or person-to-person meeting.
Imagine having this information available when you have a vehicle you need to sell. For instance, you have a dump truck that needs to go, you can run a report showing all dump trucks you have sold and who purchased them.
Imagine running a report showing your sells transaction from 5 years ago. Would this make an effective prospecting tool?