Wine on CO is a complete mystery. I'm flying EWR-HKG in BF next week. CO puts a lot of effort on their BF first meal, but the wines (& beers) appear to be a complete afterthought. I just looked at the current wine list. Most can be bought at my local merchant for $8~9 per bottle.
Search the CO group & you'll see a lot of complaining. You aren't alone!