In practice they don't, but is it because they don't want to or because the current building and social/financial infrastructure just doesn't offer it as a possibility? It's overly reductive to assume that anything that happens happens because people want it that way.

By the way, laymen did and do pay for buildings made out of brick which can last for 100s of years.

They would not pay because they would not trust that the contractors actually did the thing which made the building last more. There is an information asymmetry which creates a market of lemons. If I would build with my own hands I would use the best that money can buy.

We routinely pay for many vanity stuff that are far more expensive than lasting buildings, and we do so because we have no idea.