I think it would be fun if there was some kind of mutator that allows you to bribe the specimens to make them attack other specimens by throwing money at them, the stronger the enemy the higher the price =P
I say it both ways, seriously and as a joke, I mean, it's a mutator, just like the huge heads in UT2004, is not like you are gonna play with it all day, but it should be fun from time to time, you cxan make zombie wars... if you can afford it =P
throw money at a fleshpound = Fleshpound says, "what is money? WTF!!! You throw this green stuff and coins at me! *Fedorov dies at seeing a red light*"
ZEDs must respond with a low-pitched version of the "Money, money, money" taunt if they accept your indecent proposal.