I don't think they are overpriced. I look at it this way.
Let's say you are paying $12,000. What else can you buy that has the same power, handling, modification potential and appeal.
An S13, An rx7 series 4, liberty/legacy, GT4... and a few others.
The skyline has a nice set of features and arguably has the best interior and sleek lines.
All these cars are getting old. It's just the way it is in the 90's the japanese made a great number of performance cars for us to pick and choose.
Really 12 grand is not a lot to spend on something that's going to give you so much pleasure
I still think you get a lot of car for 12 grand with a skyline. it's my pick of the bunch.