Greed - there is literally no malus for that perk, it's not a trait
. You don't really "waste 50AP". Think of it: you throw a nade, your slot is empty, you go to your inventory AND USE 50 AP TO RE-EQUIP.
Capping the pool doesn't really makes sense, It's a perk, not a trait.
P.s.
Well, we can argue that the first thrown nade is under malus, but eh.