I'd say the only cars that qualify as comparison are those within a 300 mile radius of Pittsburg PA. Anything more than a one day drive carries much more overhead. ( $$ + time )

Is Frank willing to personally deliver any car from CA / AZ to the Pittsburg PA area for free? . . .And to add to the overhead, the buyer is free to refuse the car once it gets to PA. This would account for traveling from PA to CA only to find the potential purchase is a mess.