I will never forget the story about one of our members building one. I think they spent something like $28,000. And complained because $12,000 of that was for a really fancy fireplace. I may be off on the price by stating them too high. But you get the point.
Even those that build a $150K place, it's valued at far more than they spent. You can't compare a place built our way with a regular stick frame house. A stick frame ain't gonna last as long and will be expensive to heat and cool. One of ours, no matter the price is something that'll be around for generations.
Then again, I think most of us think of cheap more about building without a mortgage to save a hundred grand on a 30 year mortgage. Then add the cost to heat and cool on top. Plus we don't build in the now traditional residential housing developments.