Adopt a cat - - Cats = Karma. Allows you to post in /r/aww. When posting in /r/aww, your links get one more upvote.
Figure out a front page formula - All the best karmawhores have a formula. Discover your own and steadily gain 1 upvote every 3 seconds - Rebuyable
Participate in secret santa - He who gives shall receive karma. You get 2 more upvotes per link, across all subreddits!
Develop a dark sense of humor - You've seen some shit, man. Allows you to post in /r/imgoingtohellforthis. When posting in /r/imgoingtohellforthis, your links get two more upvotes.
Receive reddit gold - You get gilded by one of those super generous askreddit posters that seem to always stop right before you get there. Gain 2 upvotes every second.
Find an old PS2 in your basement - "omg does any1 remember tony from dis le classic gta game? librty city storis still holds a specil place in mah hrt." Allows you to post in /r/gaming. When posting in /r/gaming, your links get three more upvotes.
Rescue cute puppy - *insert emotional self post and adorable photo* When posting in /r/aww, your links get four more upvotes, on top of previous bonuses.
HUGE CREDIT TO THOSE WHO HAVE HELPED OUT! NANENJ, SIVERAN, JOHN, and SILLOE ESPECIALLY!