[Perfectlap]

Like many things in life you should avoid bidding where supply is tight. Go where supply is bettter which means if you want max value you'll have to travel. At the end of the day very few Porsches were limited production cars, these are the only cars I would be comfortable paying above the historical average. The danger is that the genuinely limited Porsches are lifting all the boats and when reality sets in, like a sharp turn in the economy making cash more desirable than toys, these mass produced Porsches will see the steepest drops on resale.
If you are going to cross the line and pay above the historical average price for any Porsche with a mass produced engine, make sure the mileage is low. Nearly all of a running Porsche's value comes from the engine. Overpaying for a high or moderate mileage Porsche means You're really overpaying engine wise.