Your right these engines run till 500000. The guy who I bought it off had 3 of these. 1 was an sc300 with a single turbo 2jz, the second one was this one, and a third was a nicley done up 5 spd(yes its possible from a kit on the web). He told me when it hit 200,000k he wanted to replace the headgasket,belts, injectors and installed another cleaner 1UZFE head on it with non vvt. Nothing 2 crazy as you could pick another engine like this for 700-800.
Your not an ass, these questions should have been answered in the first post but I thought if anyone was interested then I would explain all of this in person.