FWIW:
The price of a new plane has gone up since the last time I looked on
www.cessna.com. [
cessna.com.] Now a basic 160HP C-172 (Garmin G1000 is now standard equipment) is: $219,500. Back in the late '90s, a new C-172 was bout $150K (no Garmin).
There are a lot of two seater, 100HP "Light Sport" planes out on the market today that are roughly equivalent to a C-150/152. Most are running about $80K to $125K.
The cost of a new plane keeps the value of our older planes high.