.io seems to sell mainly in single words and acronyms. Within the last year the only mixed number letter combos that have sold for more than $1000, at least NameBio listed, are;
- 5G $4400
- V5 $3488
- C2C $2222
Now any trend can change, but this has to be taken into consideration in evaluating your name. While .io do sell, sometimes for good amounts, they sell in only a narrow type of name compared to .com that sells in acronym, word, two word, three word, etc.
All that said, sometimes it is overlooked that while there are hugely more .com sales, so are there hugely more .com domain names for sale, so the actual probability of a sale, in general, is higher in .io. As some have pointed out, the renewal is high in .io and that makes it hard to make the numbers work, though.
If it was mine I would try hard to sell it in year one, but probably not renew that. I take a similar approach to many of the new gTLDs I handle - if no action in year one I usually let them expire if the renewal is much more than year one cost (there are exceptions of course).
Best of luck with it.
Bob