I view this scenario slightly differently. Let's say guy "A" buys a GP with 150k miles, gives the car some mods and then blows the engine. It would be incorrect to solely blame the mods and current owner, because the car has already experienced the majority of its lifespan with other owners.
I know some people that are wealthy but very, very stingy. They will buy a brand new car and refuse to perform maintenance because they will sell the car at 100k anyway. They might have given the engine just a few oil changes in that mileage, and certainly never spark plug replacement or trans service. This type of behaviour disgusts me; the subsequent buyer gets totally screwed.
The same type of people almost definately never use the correct fuel (regular fuel is cheaper). They will usually not care to plug in the block heater or even warm up the engine when necessary.
GTP's originally had high sticker prices so I think it's fair to say many of them were bought new by the aforementioned stingy b@st@rds.
