you mean like on namebio? .io is one of the leading extensions on namebio....
it's not like .com ... but nothing is like .com...
.io is by far one of the best extensions for domainers... but like in all extensions u need to be holding the right names with sale potential.
its also doing good for me.. but u need to have a good number of them and they have to be solid handpicked things as in preferably 1word dictionary words of decent quality... you can forget 2word domains in .io.
check park,io auctions... every day and week they sell .io names... for good prices... in most cases those aren't even domains which are even close to being worth those prices.. but they run this website for longtime now .. so they got a customer base thats used to going there and bidding whatever on whatever...
hope this helps. cheers.