Here are a few examples of .io sales if that helps
cloud.io 45,000 USD 2015-05-29 Flippa
doc.io 24,600 USD 2010-06-16 Sedo
fd.io 19,999 USD 2016-01-03 Park.io
db.io 18,000 USD 2015-08-09 Park.io
tech.io 15,105 USD 2016-02-18 Flippa
tile.io 15,000 USD 2016-07-03 Park.io
music.io 15,000 USD 2016-01-09 Flippa
fast.io 15,000 USD 2015-10-25 Park.io
traffic.io 14,000 USD 2016-01-20 Flippa
crawl.io 12,000 USD 2016-06-26 Park.io
seo.io 11,000 USD 2015-01-25 Flippa
sports.io 11,000 USD 2014-07-16 Sedo
profit.io 10,999 USD 2015-11-15 Park.io
predict.io 10,000 USD 2016-01-31 Park.io
crave.io 10,000 USD 2015-11-08 Park.io
analytics.io 10,000 USD 2015-04-06 Flippa
groups.io 10,000 USD 2014-05-21 Sedo
mega.io 10,000 USD 2014-04-09 Sedo
food.io 10,000 USD 2011-03-09 Sedo
idea.io 8,888 USD 2016-03-18 Flippa
Best,
Barry