Yea, most people can't. Also, most DIY wrenchers, even experienced ones, don't have bore scopes. And even if you did, when shopping for a car, a Porsche owner is unlikely to let someone off the street dig into their Porsche with a borescope. And even then, it's 1/2 to 1 hour per side in the Boxster..so "checking it out yourself" is out of the question in this regard.
I would but only when I am serious about the car. If an owner denied that right, fine, let him sell it to someone else. A local had some serious bore scoring in his 2008/2009 Boxster and sold the car for $12K with info about the issue. A high mileage car, a driver who claims he is fast
and does not let it warm up properly, maybe poor quality and probably a bore to stroke ratio that certainly didn't help.
Hence the requirement for a PPI at a reputable dealer/mechanic.
Good luck with that one. Like I said, I have lost all faith in the trades and management. Want it done right, do it yourself.