Deal with the Devil. This perk costs 1000, it is so cheap because it gives you 50% chance of gaining a random perk. Good right? Then here comes the bad part, you have a 50% chance of losing a perk aswell. If you don't have a perk when buying it you will just get a random perk but the price will be increased to 2000. Here are some quotes I came up with.
Dempsey: Better not take away my perks, stupid bitches.
Nikolai: Tastes like vodka OHHH YEAHHHHHHHHH oh wait, I can lose a perk? The only downside to vodka.
Takeo: Lets get our random perk! Hold on a second... This can take away my perks? THIS MACHINE HAS NO HONOR!!!
Richtofen: Hmm just like the Pack-A-Punch deal, Faust is taking place and, I mean uhh uhhh what is this thingy?