Does sitting on the board of a large, multinational corporation make you a "corporatist"?

As I'm thinking about this poll question,
which seems to revolve largely around definitions, I'm beginning to wish I'd voted "Yes" instead of "No". Why?

To merely sit upon the board of a structure that is inherently undemocratic is to assent, respect, and grant legitimacy to that structure, regardless of any votes that may be taken, because the decision to sit on that board is voluntary. If one feels that corporations have eclipsed the political and legal controls that kept them in check in the first hundred years of the United States, and essentially usurped and displaced the people as the main concern of legislation in the present, then accepting to sit on a corporate board in the present grants legitimacy to today's corporatist.

I'm reminded of the nurse (a profession known for "empathy") who watched and did nothing to intervene as boot camp guards beat and suffocated a young boy to death.

One always wishes to be a realist, and work within a structure to change, but at precisely what point does the structure itself, and the preponderant way in which many corporations have injected themselves into politics, become the greatest problem to citizens in realizing the founders' promises of life, liberty, and pursuit of happiness for all of us?