Yes but how many people going would really be gamers? Compared to a Con which is dedicated to games?
How many of the games do you think already tried the game? They are going to a gaming convention to try and get gamers? If they are gamers then most likely they have tried the game already or never intend to try it. Or they are the ones that dont like the subs and are coming because its going F2P
The star wars celebration will have people that are not gamers and they have a change to get them into gaming.