Or build it yourself and save $2000
I just did the math on their entry level model because I didn't believe you, but you're pretty close with that estimate. NewEgg prices: Threadripper 3960X - $1400 16GB 3200 RAM - $70 256GB NVMe - $70 RX 550 - $70 = $1600 System76 price = $3700 That said, if you're looking at their higher-end models, I think you still have a fixed ~$2k markup, and so you're looking at something like $10k vs $12k, which isn't a big dea…
Plus you need a quality motherboard, case, power supply, water cooling. Add another $1200.