Well, basically, I mean that Imperial there have 0 name recognition. ENCE is a meme team(EZ4ENCE), NiP seems to have fans anywhere where people heard about CSGO. And Liquid and FaZe just big names. Liquid have some fans because of DOTA and FaZe because of NiKo and Guardian(I could say because of CoD, but nobody interested in CoD as cybersport). It's all about selling tickets, that's all.
PS: There were also rumors that it might be last CSGO Epicenter. If it's true, then selling as many tickets as possible should be a priority.