The Daily Grind: What MMO would you buy as a single player game?

Sure, it's fun to hang out with the other players in your favorite MMO, but nothing you do really has a permanent effect in an online game. Wouldn't it be nice, for once, to kill Quarm and have him stay dead? To defeat Illidan, and have that event shake the world forever? To finally clear 0.0 of all the pirate corps, or to once and for all rid Paragon City of those vile gangs? Do you think MMOs should have an offline, single player mode that leads into the online MMO later? Would you want to go it alone, or hire some trusted NPCs to explore lost cities and forbidden dungeons with you — for a share of the loot? If you walked into your local computer store tomorrow and you saw a new stand-up display filled with boxes of World of Warcraft: Single Player Edition (or insert your game of choice) — would you buy it?