Droping Knives and Pistoles in S&D (all weapons) or S&D knives match

Why don't you Mods and GMs do this:
When we kill someone in All Weps/Knife match
they drop the gun! Example: A noob runs with knife
and kills the dude with The axe... Or with the Pistol...
and then he can pickup the axe or pistol in that match?
It would be more fair having to try-out a axe and so you can
get more people to buy ZP.