Showing stores how to (or helping stores) promote products is something that some companies do.
Some stores don't really know how to promote products and some individuals just don't have the time to do such.
(The above applies to many stores and not just game stores.)
This is one of the reasons that many game companies employ an individual or two to be store reps (more than just a salesmen), Organized Play/Tournament director and or a volunteer program person.
In turn those companies that do assist the stores will probably receive more orders from that store than those that just have product for sale and make some sale calls.
One of the things that I spent time doing for WizKids LLC was helping stores find 'volunteers' to promote the game and product. Lots of phone/email time and personal visits to stores. If I was attending a convention some where, I would arrive 2-3 days early and have several different store visits during that time. Sometimes even a day after the Convention visiting stores.
It was not just a hello, I'm from WizKids, it was a planned boost from an official rep from the company AND assisting/offering suggestions on store layouts, promotions and game space.
Some stores only needed displays and the VIP visit to help, some needed much more. We would often work with one of the distributors in attempting to help that store get better.
And, This included showing a store how to promote all their products not just WizKids stuff. This tactic caused lots of heartburn internally at WizKids but in the long run (or at least while I was still there) it worked wonders with the stores that we visited.
Store owners get so much pressure to sale a certain product from a certain company. And in a few cases that certain product might be the over the top money maker (MtG, D&D, Clix's, etc). But in many, the store needs to provide more/different games for many customers to mantain a good sale base. Helping a store sell all its products would often make that store owner very happy and they would call us again and even buy more stuff because we helped them create a good cash flow.
Point is (as I have mentioned before), it takes manufacturers, stores and dedicated players to make the game hobby stores very successful.
Dave Chase