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We all know that Warlocks make Pacts with Devils (Infernal Pact), fairies (Fey Pact) and Elder Evils (Star Pact and Dark Pact) in exchange for power.

However, one thing that bothers me is that by the rules they aren't sacrificing anything. This is the effort to gather as many drawbacks to Warlock Pacts as possible.
Mind you, they should not have any mechanical effect so to not mess with game balance. Extremes (cannot accept divine healing and so on) should be worked out with the GM, if you insist, but (IMHO) does not belong here.

1) None! For whatever reason when you demanded power you received it and you haven't been asked for anything in return. Yet...

2) Sanity. Whether you became insane the moment you accepted the conditions or the powers are slowly taking their toll on you, you're fighting to maintain your sanity for as long as possible, but you know it's a losing battle.

3) Sickness. Ever since you signed the Pact, you've been wracked by disease. While the Pact ensures that the disease will never kill you, you are a lot weaker physically than you once were.

4) Soul. You signed away your soul to the Powers that Be. When you die you will not go to the Afterlife you once would, but to your Master.

5) Material sacrifice. You gave up your money, your home and your finest horse. Why your master would accept such things are a source of concern for you, but thus far he hasn't asked for more and you pray he never will.

6) Betrayal. You were ordered to betray your dearest loved one, whether by poisoning him/her or simply hurting them emotionally.

7) Tithe. Your pact wasn't paid for in full at once and every full moon you must tithe part of what your newfound power has granted you. This could be a monetary donation, the bones of your victims or something more intangible.

There, I started it off for y'all!

9) Humanity (or the racial equivalent :P). Power corrupts, and this newfound power of yours is no different. You begin to become harsh, cold, unfeeling, violent, or experience any of a number of other personality changes. This may or may not make you all angsty about it.

10) Compulsions. You're compelled to do something, sensical or otherwise. This can manifest itself as some for of obsessive-compulsive tic, or a task you feel the need to do each day, and could be subtle or overt. Either way, it might attract attention, it might distract you from your quests, it might weird out your friends, etc.

15). Menstrual Blood - During your womanly cycles, you have dry menses. (This is the price for my feylock, that and ...

16). Pregnancy - nuff said

20) Reward: You gambled with a Fey Lord, chased through the Wild Hunt through cunning and trickery, and took a Pact for your prize for escaping until the condition to end the Hunt was met. Just what does the Fey Lord do now? Maybe instead you did a Favor for the Fey, and they granted a Pact in return.

21) Balance: You willingly took up the mantle of a Knight for a Court(Summer/Winter) of the Fey. Out there is another being who has done the same for the opposing Court as well, your equal and opposite who works against your actions and you must do the same when it deals with the Fey. No matter your morals, good or evil, or your friends, you must take up the opposing of your counterpart just as he must do the same.

22) Speech: Maybe your patron stole your ability to speak, in various ways. Whether it be your whole voice, the ability to speak Common, the ability to speak in anything but riddles, or the ability to speak the truth, you find that communicating can be challenging at times.

23) Wanderlust: You received the Pact at the cost of being able to stay in one place for more then two weeks without desperately wishing to travel again.

24) Divine Intervention: The god or goddess you worship has granted the Pact upon you(through a proxy which owed them a favor or another way), in which you go out to do acts in their steed similar to a Cleric. Can fit very well for Corellon, Sune, and Selune. Especially for a Warlock(Paladin/Cleric MC)/Heartwarder/Sune's Chosen.

25) Conditions to Sleep well: Maybe a Star Pact must sleep outdoors to prevent from having nightmares. Maybe a Fey Pact must sleep after placing 13 items around him in a circle to allow themselves to fall asleep. Maybe an Infernal Pact needs the comfort of cool air or the heat of a fire to allow themselves to fall rest well. Not meeting the requirements doesn't prevent them from sleeping well, but they are at minimum irritated beyond compare if they don't.

26) Parent's Sacrifice: Your parents paid the dues for your Pact willingly. But the Patron holds out a deal in which you can release them from the costs if you complete his task.

27) Back to Haunt just You: A direct ancestor from as early as your parents made a deal with a certain power, and it comes back to haunt you. At least that same power was nice enough to grant you a Pact to actually have a minuscule chance at success. Though the laughter as you fumble things up and try to survive, you could do without.

28) BBEG screwed up: The BBEG was trying to forge the Pact for himself, but screwed up in the minor details. It could have been that you shared a name, blood, physical description, or even nothing except the Patron was feeling spiteful and there was not a specific target. The Patron bestowed the powers upon you, and the BBEG took the costs himself, and is kinda mad.