Here is a list of some .io domain name sales to help educate you on their value.
These are industry sales not any of our names. Note that some of them are on auction platforms which tend to get more of a wholesale price instead of an end user price.
Sun.io sold for $49,995
Bank.io sold for $80,000
Swipe.io sold for $68,000
eSports.io sold for $40,000
Cook.io sold for $39,750
CoinPay.io sold for $22,500
Source: Namebio ➡️ https://namebio.com