Before general availability started, I placed an order for a few .CO names and was actually able to catch a few that in the .COM would easily be priced at $100,000+, but I was never able to get more than a few hundred dollars offers for them.
No doubt the .CO registry has done a great job in promoting the extension, and they have been successful in generating income or scoring great sales, but I have serious doubts about the long-term value of .CO names.