A game mode where you make a new character, and they are self-sufficient. Thus, no use of shared banks, bazaar, trading players, other people for battles/dungeons/questing. W101 recycles a lot of the same ideas multiple times: new world with similar quests, similar spells etc. A solo only game mode would create an entirely new, complex and harder gaming experience.
Solo only accounts could still play in the normal game realms, but unable to interact with other players except through chatting.
