Yeah, I do the same as Groundchuck. They're useful as something to throw away when hit rather than losing your dual SMGs, Chainsaw, Shotgun, or whatever other shinies you were hanging on to. It also means that the Aaaaah!! cards are a smaller proportion of the item deck since having them in makes the item deck bigger. So yeah, they sorta have a use even when not specified but scenario, but if your inventory is at 5 cards and one or more of them are supply cards when you don't need them? Feel more than free to toss those to the wind.