When you use the +100% xp pack, it makes your character stinky and people will talk about you behind your back. I've talked to the devs and there's no fix for this, ever, coming in the code.
To prevent (social) damage to your character, admins suggest mailing all of your xp packs to me, K-h-a-l-l is how you spell khall.
Because I really care about this game, and all of you, I am willing to make this sacrifice for you. But it would be ok if you sent me credits too. In appreciation for the great sacrifice I'm making for this community. :)