Thanks for pointing out the variation in the higher end domains. EstiBot was never meant to even try to estimate accurately the high end domains, rather just give a rough idea that a domain may be very valuable. In the Guide on the site it says that any valuation over 100,000 or so is just an indicator that the domain may or may not be worth hundreds of thousands if not millions.
It's doing pretty good in the lower end, which is where it's optimized more. It has flaws, for sure, but it's wrong to say it's just "throwing numbers in the air". This is a false statement, as EstiBot has been tested and there is a statistically significant correlation of EstiBot valuations and known sale prices. P<0.0001, R squared = 0.76 in a population of about 1,000 domains. So it is proven not to just throw numbers in the air, although it does make quite a bit of mistakes, and my job is to reduce the number of those obvious errors.
If you take 5 domains and don't like what you see, and at the same time demand that it is accurate with 500 consecutive domains, from a statistical viewpoint that's a self-contradictory argument and also neglect the fact that humans will not be able to accurately appraise 500 consecutive domains either.
Experienced domainers are better than EstiBot, but it may serve the less experienced ones in giving a starting point for human valuation (which is its intention). EstiBot does not claim to be a all-encompassing solution to appraising, rather just one tool you may like to use in your research. EstiBot also gives you keyword research data for your names at a glance: search popularity, search results, title popularity, anchor popularity, and backlink data. It may be useful to some.
By the way, inspired by this thread, I did some heavy testing and came up with Beta v2.01

Now many flaws again have been fixed, and it has gained in accuracy. EstiBot is still in its early phases and I will work to make it better. Plus I will try and add more keyword tools for the convenience of the user.
e.g. the domain names mentioned in this thread are now much closer:
tandberg.com sale price $1,500,000 estibot 29,143
iran.com $400,000 2,984,711
shemale.com $520,000 510,682 (correct spelling is shemale, not she male as in above post)
realestate.net $300,000 282,331
campgrounds.com 175,000 968,884 (correct spelling is campgrounds not camp grounds)
These are nicely in the ballpark, with the exception of Tandberg, that's just one of the types of domains that are very, very hard to appraise automatically.
As for iran.com - well, it's a nation-state, so the domain may well be worth 3 million next time around. Previous sale prices are not necessarily the absolute indication of current let alone potential value.
Thanks for discussing my system, this all helps me greatly during the beta testing phase, and my aim is really to make this a useful research tool, I would not even want anyone to use this tool as the sole source of information when they are buying or selling domains.
I did a little test myself to wrap up today's session. Here are about a 100 consecutive domains - the latest NameBio known sales in the order in which they appeared. They are mostly nicely in the ballpark, with some exceptions of course. Bazaar sales are hard because the sale prices are very low and obviously the buyer thinks the domains are potentially worth more. EstiBot thinks like the buyer. I'm always looking for the anomalies, and trying to find out why they happen. Many times they just happen because the domain market can be damned unpredictable
An appraisal of 500 for a known sale price of 3000 is good. An appraisal of 10,000 for a known sale price of 60,000 is good, and vice versa. These are indicators of ballpark value. Whether any given name is sold at 1,000 or 10,000 is, ultimately, anybody's guess, depends on the motivation of buyer and seller.
I challenge you to cover with your finger the Estimate and Known Sale Price and try to guess the sale price yourself before peeking. Can you beat EstiBot on 100 consecutive domains? 1 point for each domain that you get a closer estimate than EstiBot. It's not that easy....
Namebio.com latest sales 13/jun/07:
domain- estibot valuation - sale price
lebenswert.com $2,945 $3,388
vstat.com $1,269 $1,288
topexotic.com $531 $300
sharewise.com $338 $3,020
mestream.com $425 $500
iran.com $2,984,711 $400,000
connected.co.uk $73,332 $157,931
businessplan.com $741,070 $70,000
galabingo.com $64,074 $65,750
trackandfield.com $193,112 $57,000
luaus.com $6,953 $50,050
rightfit.com $3,601 $50,000
triple.com $81,355 $48,000
territory.com $53,574 $30,000
golla.com $8,749 $30,000
udbank.com $362 $25,250
pachildsupport.com $82,167 $25,250
specific.com $85,259 $25,000
answerman.com $5,163 $23,750
e-money.com $30,370 $23,000
careerexpo.com $3,833 $21,250
premios.com $22,683 $19,662
ecampaign.com $7,139 $17,750
lgd.mobi $1,398 $10,000
forexplatform.net $405 $7,877
atl.mobi $9,702 $5,500
webawards.org $527 $4,000
synchronicity.net $835 $4,000
nuclearsecurity.org $268 $3,271
saintlouis.net $5,301 $3,234
mature.info $8,454 $3,100
barker.org $904 $2,788
schoolloan.org $1,842 $2,500
edesign.net $4,634 $2,500
bro.org $3,411 $2,399
fays.net $103 $2,237
magnus.net $805 $2,000
farnell.net $241 $2,000
peoplegroup.net $287 $1,888
newliving.net $155 $1,888
educatedconsumer.net $42 $1,888
resultados.mobi $70 $1,792
sge.eu $103 $3,858
poker-games.eu Reg Fee $2,661
thecradle.co.uk $1,269 $2,000
saphosting.eu Reg Fee $1,596
kfje.com $76 $15 <---these are bazaar sales...bottom dollar
seasidelooks.com $117 $2
allculturedpearls.com $110 $1
dreamsflourish.com $127 $1
ironparkbench.com $269 $1 <---bazaar sales end
nzr.mobi $297 $250
seoa.com $475 $798
typoerror.com $948 $70
webpagedesign.info $1,273 $80
array.mobi $8,636 $250
sdv.mobi $3,024 $295
centralperk.net $78 $450
preciouslittlebabythings.com $20 $3 <----bazaar bottom dollar sales
veae.com $151 $20
indianahomes.info $55 $40
vdde.com $191 $15
malibucondos.info Reg Fee $21
pokerhome.us $64 $31
basketballdot.com $52 $5
jewishdot.com $83 $5
rewardsemail.com $184 $20 <---bazaar ends
sqe.mobi $1,119 $210
12n.com $1,203 $760
9ia.com $1,348 $1,350
exchanger.com $10,999 $10,000
horsetrainer.org $483 $388
blogposts.com $1,974 $580
neworleanspizza.com $4,732 $550
easybiller.com Reg Fee $480
icierge.com $36 $1,000
getemup.com $1,126 $10 <----bazaar bottom dollar
sublimeglow.com $591 $4
iherethat.com $548 $21
coolreport.net $32 $23
zeie.com $202 $15
zeoe.com $484 $15
zeoi.com $123 $15
smallplastics.com $532 $4
tlvz.com $448 $15 <---bazaar ends
2008.info $2,709 $608
carfinancing.info $106 $95
wxa.com $6,496 $5,719
Cheers!
Josh