Do people actually buy laptop/desktop from system76? I tried to price a laptop from them before and it was quite expensive compare to main stream vendors like Dell. Its cheaper just buy a OEM laptop and slap ubuntu on it.
Look at it like you would a Macbook; Apple charges a premium but the benefit the buyer receives from that extra cost is hardware and software that feels cohesive and works perfectly together. I'm not saying System76 has reached that same mark just yet, but it's what they are working towards and they have made great progress in that endeavor.
With all of that said, there's something to buying a used or marked-down Thinkpad and installing your distro of choice; you'll (usually) get a great device with excellent Linux community support, and in my opinion the industrial design of the Thinkpad series is more appealing than System76 machines. Personally I don't care for Lenovo because of their past malware shenanigans, but they do make solid hardware.