For-profit businesses are always free to contribute, respond, and help maintain pages about their business on a wiki. These pages are maintained by the community as a whole, and the pages should be written in the voice of the community, not in the voice of the business. Pages about businesses should serve to inform and teach the community as a whole, not promote a particular for-profit business. What's this mean? This means that adding stuff like promotional material (without any other value, e.g. it's not historical, newsworthy or otherwise interesting) and advertising is generally not okay on pages about for-profit businesses. We tend to consider things like long product price lists to be promotional in nature, but there are exceptions.