ke.ai - sold on Sedo for $2500 - (2014)
travel.ai -sold on Sedo for $3528 (2014)
x.ai - sold on Sedo for $3000 (2013)
f.ai - sold on Sedo for $1734(2013)
Come on man....none of the tld gets sold unless people know what it can be used for. .io is Indian Ocean territory tld and people still use it because they think it can be used in Tech industry as it resembles Input/Output. Similarly .ai can be used as Artificial Intelligence which is the future of technology...
I agree that .io domains are in trend right now and can bring you profit, but people, please stop with this (.io) input/output, (.ai) artificial intelligence etc... BS.
Should I take all .im domains as they are Internet Makreting. Or .hr domains as they are Human Resources. Or .ch because it is Channel. Or .it because it is for IT business. The list could be continued with any ccTLD.
Ok, some will say: But .io is also treated as gTLD by Google. Yes, that's correct. But also are: .ad, .as, .bz, .cc, .cd, .co, .dj, .fm, .io, .la, .me, .ms, .nu, .sc, .sr, .su, .tv, .tk and .ws.
Look what they "really" mean:
.ad (one real word extension, each company that care to marketing will want to have its name or the name of their brand or niche in this extension)
.as (American Society, any American company and individual should use it)
.bz (business, if you run business website you must have .bz)
.cc (credit card)
.cd (cd, music)
.co (company)
.dj (DJ, music)
.fm (each radio station should have it - this could even make sense)
.io (input/output)
.la (I am sure you are not from LA if you dont have .la)
.me (military experience, whoever has it should own .me)
.ms (milf sex, you must have .ms if you have a website with milfs)
.nu (new universe)
.sc (social crisis, websites should offer help to people with socials crisis only under .sc)
.sr (South Russia, any company from South Russia MUST use this extension as it would be natural)
.su (the same as above, but with Uruguay)
.tv (this one makes sense and it is accepted, if you have good keyword)
.tk (if you are a spammer you must use .tk)
.ws (website, not matter that out there is real .website)
Yeah, right
By the way, people don't think that .io could be used in Tech industry as average man has never heard of .io. But domainers do
.io is accepted among the startups, but that's it, with few exceptions. I also have some .io, but just as speculation because of this hype.