A comment one of my friends made while we were playing hard and easily popping the heads off of scrakes before they got near us made me think of making this sign.
In hard+... £500 to get rid of one Fleshie (due random zig zagging, grenades, aggro stealing misses do happen which causes additional £250 bill) while Demolition guy gets rid of them with no problem and way cheaper.
I'm not sure if it's still the case since I don't use it, but you used to not be able to carry anything with it so you had to rely on your team a lot more. Other than that, it's too expensive to fill @ 5k. I just stick with the crossbow, cheap and only 2 shots at most on harder difficulties if you're a good shot. If you learn to use it properly, you can shoot 2 bolts very quickly and switch back to your primary weapon with the number keys to continue fighting the hordes.
Late reply but, I figures out on hard it works but on suicidal and on hell on earth you need to back stab it with an axe xD Its damn hard I tell yah xD!