There may be DHS restrictions that would prevent Amtrak from inserting marketing videos between the security message loops. Would not put it past DHS to require that only security videos be played on the monitor.Every time I go to 30th Street Station, Philadelphia, I think of a missed opportunity for promoting Amtrak long distance trains.
As at most NEC stations, there are multiple displays in the station that constantly loop that dreadful Amtrak security video. Passengers waiting in line for trains can't help but see that same video over and over and over. I get that is it considered important, but while showing it, why not intersperse videos of various LD train experiences between the security stuff. I can assure you that many of the people waiting in those lines have no idea what long distance trains are like, or that they even exist. A video showing the best of the Zephyr, the Chief, or the Auto Train might just plant the seed for a later sale. The cost of making the videos would be the only cost involved.
Even if Amtrak can insert marketing videos, you are likely overestimating the benefit. For one, people quickly learn to tune the security video loops out and that may still apply if there was a periodic promotional video inserted in the loops. Secondly, Amtrak has large signs and posters promoting the LD trains in the major NEC stations, so few regular travelers on the NEC are likely unaware of the CZ, SWC, AutoTrain, etc.
There would be a cost beyond making the videos in that someone has to program them into the security video feed, periodically update the video loops. Should be a small cost, but not zero. I think it would break the background monotony of the endless security video loops and am not opposed to the idea, but I suspect the benefit in marketing awareness would be small.