Fair calls, I do agree that when people post negative comments like 'your dreaming on that price mate' piss me off badly. It hurts the sale as a whole.
However, some prices are meant to be haggled with. Take your example of $500 for the RB25 turbo, i mean, $150 is pretty stupid, but you could have someone who only has $400 and they're turbo has jus gone on their RB20! May as well make the offer and see if the seller is willing to take the $400 for a quick sale.
I remember when I tried selling my Series 5 Rx-7. It was an automatic, but it had 80,000k genuine and was in literally perfect condition and unmodified. It had a relatively easy life. I want $12 for it, and i got a few dumb sh*ts saying you can get a manual one with heaps of mods for that much! They could have at least PM'd me instead of messing the thread up.
lol
I wasn't intending to rant myself....honest.
/rant