Originally posted by Toblerone
How does it become useless? You can attack it to the Ballistic Knife for ridiculously fast knifing. It's good for the Space Monkeys and when you upgrade the Ballistic Knife w/ Sickle it's a one hit kill till round 13.
Plus, you only need to kill around 20 Zombies to pay it off. In the long run it is actually beneficial.
Especially if you have a shotgun or raygun around round 20, if you don't kill a zombie first shot you can knife 'em once or twice and kill them
It's really benificial especially since you only need juggernog to be successful with it