well i know how everyones always say "yeah HP most imp. thing for warlock.. Allakhazam blah blah" and people also use imp as a mana battery right? well why not add 3 points into imp. imp to get the extra 1k life in bonus u get from blood pact.
http://www.worldofwarcraft.com/info/classes/warlock/talents.html?2501220512230115512011350000000000000000000505000010000000000000
tell me what you think