Estibot might appear to be a hit or miss at times, but more often it produces numbers closer to what a domain should sell for. It can't be the sole source of determining a domain's true value.
There are a ton of factors that go into how one may put value in a name, and without knowing the name it would be hard to really tell you what it's worth or if you should have bought it.
Estibot is just one factor, but with everything it needs to be taken with a grain of salt?
Just because Estibot says a domain is worth $23k does it mean it's actually worth 23k? No.
Just because Estibot says a domain is worth $23k does it mean you will sell it for 23k? No.
Just because Estibot says a domain is worth $23k does it mean you won't sell it for more than 23k? No.
Estibot is hit and miss, but I use it more as an indicator of a good vs. bad name, instead of a hard valuation.
And even having said that Estibot is not always accurate.
So much goes into valuing a domain (not in order):
- Extention: Preference for the .com
- Length: The shorter the better
- Niche: Growing vs decreasing niche
- Age of Domain: The older the better
- Ad Competition: The higher the better
- Other TLD Extentions taken: The more the better
- Term(s) Used: The more common the better
- etc.
Those are just a few. I've probably missed some.
Also some domainers do well buying and selling names that fly in the face of everything I just listed.
So there isn't one recipe and you definitely can't blindly believe what Estibot spits out.
But I think it can be a useful tool if it's used as a part of a bigger picture of evaluating the value of a domain.
Just my 2 cents.