Honestly, the whole "you could buy a track car for that" argument is so off the mark.
My rig which I think is a fairly decent setup (CSWv2, BMW and Formula rims, modified CSPv2s, DSD Pro Sequential Shifter, Buttkicker, Amp and Simvibe, triple screens and a PC) set me back a few thousand for sure, but it is nothing compared to what I've spent on my actual car for track days, and it's still a WIP.
If you want to do it properly you need safety gear, clothing, helmet, HANS, fire extinguisher, seat, harness, cage, engineers cert, entry fees. There goes the sim racing rig build budget right there before you even hit the track.
Sure, you can do it at a more basic level, but even then you have to ensure the car can run reliably.. Tires, brakes, fuel, oil and other fluids, tools, upgrades to basic mechanical integrity in order to actually use the car properly...
With a simulator you can go to any circuit you want in any car you want for as long as you want whenever you want with no significant ongoing costs.