I have a sim rig. I think it came in around $6k in total.
GT Omega Prime Cockpit
Fanatec CSL DD w/ Boost Kit
Fanatec McLaren GT3 Rim
Fanatec ClubSport RS Rim
Fanatec CSL Pedals w/ Load Cell Kit
SHH Shifter
Self built PC w/ Ryzen 5600X & RTX 3080Ti
Samsung Odyssey G9 Super Ultrawide Curved Monitor
Probably a couple of smaller items I'm forgetting to list
Rig
Fanatec Load Cell Brake
Cheap-o Custom Button Box
Custom PC
Some
rough cable management