Valve starts you off with some basic credibility. You matter because you work there. You wouldn't have been hired if you weren't already credible. That's how it should be.
American corporatism is based on Original Sin (the so-called "Puritan work ethic"). If you're not "saved" by some rich institution (a job) then you're judged to be a leech and a failure. Most companies take advantage of this by continuing it into Credibility Scarcity-- you're worthless until told otherwise.