What? LOL. This is such an exaggeration. Let's break down the costs;
CPU: $550 (AMD 5900X) or $540 (Intel 11900k) both TOP of the line
GPU: $700 (RTX 3080)
PSU: $120 (650w)
Motherboard: $200
RAM: $100 (16GB)
Case: $150
Cooler: $200 (Corsair Watercooing)
Storage: $100 (Samsung 1tb NVME SSD)
Total's roughly $2,100 and this basically gets you as good a desktop as you can possibly get, otherwise, you're moving into RTX 3090 / 6900 XT territory and Threadripper. And if you did that, you'd basically have a PC that essentially smokes the Mac Pro for a fraction of the price.
But, I haven't factored in the cost of a monitor (and there's so many to choose from), me personally I like the Acer Predator XB271HU (2560x1440 @ 144hz, IPS) for roughly $400. Plus mouse and keyboard... again, a ton to choose from. So, lets say roughly $2,500.
So what do you get hardware wise from Apple for 2 grand? A slower processor, higher resolution monitor but smaller screen with a low refresh rate, Mac OS, small form factor, SLOW GPU.... and this is a big one: no upgrade path.
It's funny how you think people spend thousands on PCs when people also spends thousands on Macs. Have you forgotten how much the Mac Pro costs? It's starting price is $6,000 LMAO.