So, 89911 - you won't mind if I stop by your house and 'borrow' your 911 for a couple of track days, would ya? After all, I would never rent or buy your car for a fee anyway, but I would like to check our your car and see how accurate your description of it is. In a way, it is free advertising for your car.
Just make sure the gas tank is full and the oil's topped off before I take it -- I shouldn't have to pay for that - after all, it isn't my car...
Using someone else's carfax isn't a big deal for you, but for the folks at carfax who make their living selling their services, it is a big deal.
-Z-man.
PS:
Food for thought...