e30 m3

does anyone here own an e30 m3? how much did you buy it for? ive been looking at prices for those cars, and people are selling them for like 6 thousand over blue book value. like i saw an 88 with about 140k on it, and was selling for like 13k, everything stock, isnt this sort of a rip off? i know they re kinda rare, and the demand for it is higher than normal, but is that a fair price? ive seen others in similar condition selling for around 7k.