Ever since the beginning of MMOs they have been marketed with a lady with huge mammaries in skimpy armor on the cover and in prominent promotional artwork. Im guessing the marketing concept being pushed here is "hot women play MMOs, come meet them" which is sad in itself... but nevertheless it is effective. History has shown product + hot woman = sales.
Everquest Big Boob Lady: http://eqnexus.com/wp-content/uploads/2013/12/Everquest.jpg
Vanilla WoW Night Elf in bikini: http://i795.photobucket.com/albums/yy233/Gamethingie/world_of_warcraft_female.jpg/
WoW BC Blood Elf Blond Dominatrix: http://stevenmepham.com/wp-content/uploads/2013/07/world-of-warcraft-hd-wallpapers-10.jpg
Rift Cover: http://cdn0.spong.com/pack/r/i/riftstorml378980l/_-Rift-Storm-Legion-PC-_.jpg
EverQuest II Cover: http://www.wired.com/images_blogs/photos/uncategorized/2007/05/11/eq2.jpg
Even SWTOR had a hot jedi, minus the chainmail bikini, of course: http://www.geekpeeks.com/wp-content/uploads/2011/07/Swtor_cover.jpg
And ESO gets... a dwarf looking Nord? Total b***r-kill here guys...
http://www.legendra.com/media/artworks/pc/the_elder_scrolls_online/the_elder_scrolls_online_art_15.jpg
C'mon man.