So I used to blog about the top 10 daily sales for each day on Ali Zandi's blog last year. In my blog posts, I included the Estibot valuations for each of the top 10 sales.. Basically, as soon as the sales were posted on Namebio, I went and got the Estibot valuations for them. 99.9% of the valuations were completely inaccurate, especially for brandables. They weren't even an order of magnitude accurate; they were just flat out wrong. And I can say this with all confidence because I checked the sale prices vs Estibot valuations every single day for a 4-5 month period and blogged about it.
Anyway, what estibot does, is that sometime around noon each day, they update the valuation to reflect the sales price for each name. So if blahblah.com was worth $0 on estibot yesterday, but sold for $1200 today. Some time tomorrow, they will update the valuation of blahblah.com to be $1200.
Either way, most domainers who've been around for a while, and who've observed, learned and read, kinda have an idea what a domain's price should be, especially in their area of expertise. For example, if you're into brandables; you'd know that BrandBucket would probably price your brandable for low to mid $xxxx, but if you have a really great brandable, then brandbucket isn't the way to go because you can get high $xxxx to low $xx,xxx at Uni or Sedo. Best bet if you don't want to pay commissions is your own landing page. But I digress, my point is this: you read enough and observe enough, you learn, and you soon discover that Estibot is a waste of money that will suck you dry of your $30 each month. Been there, done that. Live and learn!