“The Market” isn’t “readers of Hacker News.” It’s part of the market, but it would be foolish to let critiques here drive decisions. If we listened to Hacker News Dropbox potentially wouldn’t have been a thing.
I'm guessing it will be an expensive keyboard. As such, HN is probably the best market because we will be the early adopters, and our colleagues will see our awesome new thing and perhaps also want one.
Dropbox is a very useful thing for most people, and it's not expensive. That's a very different scenario than this keyboard+HN.
This is one product that I think HN might be "the market" (or at least a huge chunk of it).
The key IMHO is to sort through the comments/critiques and dismiss the overly negative grumpy ones from the people who crap on everything, but hone in on the ones that have a ring of truth to them. Those should be used to drive serious thought about improvements. At least, that's what I would do.
Dropbox is a very useful thing for most people, and it's not expensive. That's a very different scenario than this keyboard+HN.