MMOs sell better than you would think, but in the realm of hundreds of competing, non subscription based games, making it on to the best selling list at any medium is a feat taken almost exclusively by preorders and World of Warcraft.
So despite what people may be saying about the Star Trek Online open beta, the majority appears to disagree. Coming in at #3 on the Steam best seller list: Star Trek Online, digital deluxe package. On Direct 2 Drive, Star Trek Online is taking the #1 and #2 spot in terms of sales. Star Trek, which just recently went into open beta, and launches early January, offers players a large variety of pre order exclusives depending on which retailer they purchase from.
Coming in at #5 on the Steam sale list: Global Agenda. Global Agenda will feature a Crimecraft style subscription program (The new, not the old) from the get go, with the regular online game being free to play, with the persistent more MMO-esque parts of the game requiring a subscription fee.
Finally, at #9, the only title on the list that has already been released: Aion! Even though Aion is so 2009, it still makes its way onto the top sales charts.
MMO Fallout 