This is a really good question and a really good point.

There used to be a list of companies that "use" Node in some capacity, which appears to be removed: https://github.com/nodejs/node-v0.x-archive/wiki/Projects,-A...

The time spent learning and configuring Node seems to have more cons than pros, for most projects, in my own anecdotal experience.

Things like Horizon (http://horizon.io/) are changing this for the better. And are doing a really good job of making Node accessible.

Might be one of those things that is popular mostly on the coasts. Here in NYC I spent little to no time jobless after I learned Node. Not sure how it is elsewhere.