When using a grenade arrow, do you choose the kind of grenade it emulates when you buy/craft it, or when you fire it?
I could almost see the high cost being worthwhile if you've got one item that can turn into all sort of different blasts for different situations. Need to put it a fire, okay, I have a grenade arrow, so foam grenade. Need to cover your escape, smoke grenade. Need to take something alive, riot grenade. Etc.