> If the domain owner doesn't provide an email on the website reached through the respective domain itself it's probably a signal that they don't want to be app

> If the domain owner doesn't provide an email on the website reached through the respective domain itself it's probably a signal that they don't want to be approached. Not true. Many people don't realize the value of what they have. And/or they won't see a message because of spam etc (could argue that this happens with whois also but generally the more clues the better). Note that with physical real estate it is often purchased by someone wanting a property that has no sale sign. Also (per my other comment) there are many people who don't know the value of what they have. So it's not a signal at all in many cases (I have over 2 decades of first hand knowledge of this btw.) Besides it all comes down to price. You may not want to sell your house but if someone comes to offer you 3x what you paid you might listen to them. You may 'not want to sell' for what the market price is. Selling prices for domains are all over the map.