I am really surprised he didn't keep Emma on his book as a regular. He really knows her voice as a character.
Gerry Dugan must have totally twisted Hickman's arm and pinned him to the ground to get Hickman to let him have Emma as an ongoing character.
Anyway, it's been established many times that Emma Frost runs one of the largest companies in the world Frost International. On top of that, at the time of House of X #5, Emma is also the Lord Imperial of the Hellfire Club and has control of their worldwide organization which includes shipping. I am not sure but I thought with the name Hellfire International that she might have merged the organizations and brought all of their assets together in one company. Either way, Emma is the richest and most influential mutant in the world. I would say Warren and Bobby are probably influential too, but I think with all of the assets of Frost International and the Hellfire Club under Emma's control she may be richer than Tony Stark now.