I think a Stickley dining set or side hutch is probably ~$12k not on sale, and a sofa could probably go anywhere from $6k to $20k, but YMMV. (I don't personally own anything like that.)

But even brands like Herman Miller or Ekornes can really add up. (And I don't think of them as being the highest-end of things. Even hiring a quality woodworker to make something for you can end up similarly priced depending on detailing, finish, wood species, etc.)