The short version
The chamber was formed in 1946 by a dozen businesses who were tired of finding out about things afterwards. That is still most of the job.
We are a membership organization, which means we work for the businesses that pay to belong and for nobody else. There is no public funding in this and no landlord's money. When we take a position, it is because the members took it first.
The office is small on purpose: two staff, a board drawn from the membership, and a set of committees anybody can sit on.