Power comes from sharing information, not hoarding it. One way to become powerful is to share information, refine and improve it, and/or use it to connect people with each other.
Opinions compound and decisions are peer-reviewed. Decisions are subject to peer scrutiny. In other words, the crowd has the ability to weigh in on the direction the company is taking. This is very different than giving all crowd members veto power, or even a vote. Enterprise 2.0 does not mean setting up a corporate democracy (even Wikipedia is not a democracy).