It's completely out of control. I follow a GT3/RS car for sale thread on Rennlist and even that groups is surprised at the GT3 prices. Its all used cars just extreme on more expensive cars.
In late 2019 I was looking at .2 GT3RSs in the 180-190 range. Outside of a Weissach there were many to choose from. Some of the exact same cars are now for sale for over 210k and have changed hands a few times. A Weissach GT3RS sole for ~274k over the weekend on Bring A Trailer. That's GT2RS territory in late 2019 early 2020.
https://www.classic.com/m/porsche/91...s/?interval=1y