I think keyboards are like shopping carts. Get one with a sticky wheel, and you'll find it terribly annoying and distracting. Get one that rolls smooth enough and you don't think much about it. The difference in return between "passably good" and "extremely high quality" is incredibly small, so let's just be honest here -- this is a luxury, not a career requirement.
But then to put it in Gladwell terms, it's been my experience that keyboards are pasta sauce. Some like theirs chunky, others like theirs... low profile? Oh well, at least my first metaphor stood up...