The author's intent is also important. When a person posts to a forum, they know that they will not receive compensation for it. When someone releases a book under certain Creative Commons licenses, they are aware that they will not receive compensation for it. When a developer creates open source software, they are aware that they will not receive compensation for it. The fact that someone else may generate revenues from it is, quite frankly, irrelevant. The people getting money in those cases isn't even a pirate (in most cases) since they have been granted permission to use those works.

The difficulty comes when a site hasn't been granted permission. And that problem exists whether they are profiting enormously from it, just covering costs, or not generating any revenues whatsoever (directly or indirectly).