The policy as Alan mentioned was not always that way, which may be the reason for confusion and misgivings being expressed here.
From the forum's very beginnings just over 13 years ago, the standing rule was that no posts that contained any type of formal advertising was permitted on the primary forum. That was due to OGR's preference as well as the general membership. This standing rule was also grandfathered in once the forum expanded into other forums and the sponsorship came into being.
Obviously that policy has changed more recently within the past couple of years or so. Personally I don't really mind seeing these sales posts from Pat or from Charlie from Nassau Hobbies so much, although I can certainly understand some misgivings expressed here; after all the concern of an inrush of "advertising" on this and the other forums resulting in a spam-like atmosphere is a valid point. I certainly would be turned off if I saw it becoming prolific, although it certainly hasn't proven to be so far.