What in the world are you talking about? Smart Contracts?? You don't have to pay a Realtor, as is, if you want to sell. ANY time you have someone sell something for you, you're going to pay a fee so some crypto thing isn't going to change that.
Lol...
Simple... it is called thinking outside the box
A smart contract can help automate the proof and transfer of ownership by putting the ownership record and transfer rules directly into the blockchain system. Instead of relying on a realtor, lawyer, or escrow company to coordinate the process, the blockchain can show who owns the asset, and the smart contract can automatically transfer it to the next owner once the agreed conditions are met.
The important catch is that, for a house, this only works fully when the legal system recognizes the blockchain record as the official title record. That is the part that could eventually become mainstream, and it is a big part of the long term purpose of crypto. It still needs regulation, but it can remain decentralized in how the system operates. Today, a smart contract by itself does not replace the county recorder, title company, or legal paperwork that proves ownership under the law. So the idea is not that code magically proves you own a house. The idea is that code can automate the transfer process once the law and the property record system are built to accept it.
If you are in this business, I would strongly suggest taking a deeper look at crypto, because at some point it will become mainstream. A lot of people still misunderstand what crypto is actually for. Too many people only see the scams and miss the larger purpose, which is to create a more direct, efficient, and programmable way to move value and prove ownership.