Many games have trailers , why can't era have one? As a whole not a trailer as an update (like the one of countryside) you can have the players submit a URL or upload a video to the video they made and the best one gets to be shown on the places where trailers are shown (youtube,google play,...) or the staff can make their own video with there own sfx , specially since they can make their own levels and ganis to impress the viewer.
What's good about it?
1-Making that will encourage the viewer to download and play the game
2-the viewer will have an idea on what is he going to see inside era (other than pics)
3-being able to visualize what he's going to play makes him want even more to play it
4-good commercial for graal
5-makes the players that had quit era regret that they leave (maybe)
6-encourages players to work for staff / encourages youtubers to make more videos.
What's bad about it?
1-nothing I can think of