it isnt just skylines or even performance cars struggling to move, i think its that way across the board. My mate had his stock BA XT falcon on carsales at a competitive (low end of what its worth but non suspiciously cheap) price and got absolutely no interest even though it was in good nic.
The other option which ive been doing with my turbo pulsar is consider swaps, if other people are having trouble they might consider it if you find the right person eg. P plater got done driving a turbo and wants to go NA, someone needs a 4 door, etc..