Is Estibot Reliable for Appraisal?

Hello guys, I need some advise, I have couple of .io domains in mind that have a estibot of $600+ , cpc as per estibot is around $10-20, I was wondering are these worth flipping? We all know that .io domains are getting popular these days, and the cost for registration is high as well compared to other tld's

Thanks in advance

No, you should never judge a website based off of ANY online website calculators, there a million other factors that come into the worth of a website.

Even thou they are unregistered domains? what are some of the major factors?

You might have to wait few years before you are able to sell .io domains for $600, but it's definitely possible. As long as the use of .io domains keeps growing as per the current rate, stuff like this could happen.