It's entirely different if you're buying the housing already built; there's no productive activity, you're just a rentier and do not benefit at all from falling housing prices.
The differences in interests between an asset holder and a productive builder are night and day.
Right... my point is that the costs are not far below the eventual sales price. That's why construction is slowing down.
And as mentioned several other times, it's actually not as simple as cost > sale price. It's margin > margin of alternative investments of similar scale and risk profile.
Every single municipality in the US I'm familiar with has done everything they can to make it expensive to build and try to remove any profit margin from building. Which leads to capital moving towards piggybacking on the rentierism of the average homeowner, the people who control the policies that make it unaffordable to build.