Those are prices I'm comfortable paying for a ThinkPad, XPS, or Macbook. And all of them run a Unix variant (Linux or MacOS) very well. System76 needs to be offering similar levels of build quality and support for those systems to be worthwhile.
They are not offering the same level of build quality. Not by a long shot. At my last company we started with System76 for both desktops and laptops, but ended up switching to Dell for laptops and Exxact for desktops.
The System76 machines are also just Clevo laptops that are rebranded and sold. You're literally paying a "premium" for them to install a working version of linux and offer support on top.
Yeah, that's what I've heard. I don't have firsthand experience with their laptops, but I have no reason to expect (and many reasons to doubt, based on reports here) that they match up to the others in their price class.