Your assuming facts not in evidence. I don't know what happens to an engine that sits for at least 9 years with the same oil(slightly polluted) in the bottom, un-circulated. And I'm not going to find out. Will it need to be drained and flushed? Will the oil pump die prematurely? If the tires are slightly hard and unusable would it not make sense that other rubber parts(seals, hoses, brake-lines and o-rings) are in about the same shape. And a gas tank filled, or half-way filled with the lovely crap unleaded we havta use today.....I'm sure that's virtually "wear-free" as well. I can agree that the engine MIGHT require the least effort to make road-worthy. But I don't think it's worth $8000.
Case in point; my recent purchase of an 04 with 41,000 on the clock. $4500. I highly doubt that engine will wearout in my lifetime. IF it does, I've got $3500 in the bank to go find a $2000 engine.