The part you’re talking about, actually registering the title, is usually between $20-50 usd.

A smart contract would do nothing to protect you from open liens, property line misrepresentation, multiple registrants, etc etc.

But I hear you saying, “well it would if the plumber used the chain to place the lien.” okay fine, but nothing above is solved more efficiently with the chain than it would be by adding to the existing system.