Hi,
OK, the (negotiable) asking price is high but there is another way of looking at it.
Imagine you've bought a 'bargain' R30 (nothing special but in fair condition). What would it cost to "do it up" to the level of GTR30's car? Add the cost of a full re-trim, springs, wheels and tyres, engine modifications, brakes, repaint, etc... What would all that cost? My guess is at least $5000 which is approaching the price listed here on the for sale thread.
As Ghostrider mentioned, it's a limited market and there are plenty of other $7000 cars out there. There's hope though, buying isn't always a rational decision.
JH