User blog comment:Dar'Rajhin/Skyrim: Hearthfire DLC Details Leaked/@comment-5433941-20120824233402/@comment-2081141-20120825130623

Actually you're not doing quests for your fellow guildmates, in the Companions you are doing your JOB by serving the people of Skyrim. The theives' guild does it for profit, the DB does it for Sithis, and the College does it for their own reasons (haven't played them, so wouldn't know).