I'm not quite sure where the problem is, but...
I have an event set up like so:
onPlayerKill --> Killer(Client) --> VCE_modVariable --> Cash [add] 100
onPlayerKill --> Killer(Client) --> bottomPrint --> "Cash: <var:cl:Cash>" 3
However, it seems that only the first time the killer kills someone does he get his cash. Halp?