[Perfectlap]

You should look at this way, without the PPI you don't really know what the car is actually worth. Once you have the PPI in hand you can start creating a budget for what x,y and z will likely cost you if you decide to keep the car for a while. You also need to put down on paper the likely repairs that are common to this car that don't show up on the PPI.
For instance my car went in for a full diagnostic at the 65K mile mark. The dealer service dept rep came back with an extensive list of things that would be right around the corner including but not limited to clutch, shocks, brakes, coil packs. Not long after other things let go without warning, all things that are very common to this car once mileage gets up there. If you buy one of these cars without a PPI you better one of the following:
a credit card with a high limit, $5K in cash under your mattress or a garage, a full set of tools and lots of free weekend time... or depending on the mileage and wear, all of the above.
Or bite the bullet, dig deeper into your wallet and buy a car with low miles and lots of pampering.