"GAME PUBLISHER section" means the companies who publish games.
For Example: EA Games, Activision, Ubisoft, Eidos etc.
These names are very popular and almost many people know about these companies. But there may be so many other companies are there who publish games.
Like your section "3D Engines Database" we people getting knowledge about various game engines details, like this we want to know about various details on game publishing.
Those who are developing games but not able to publish in their own site, they people wants to know about more on publishing.
So this section could be very useful to people like us...