Yeah we had a discussion about this (Jo and I)
I'll elaborate some more.
Whenever you hit F11, instead of showing the number of Frags under the score, it shows an amount of money.
Also, certain gun kills will reward you with more money than others.
Whereas car or heli kills reward you with a minimal amount, Stubby's more money, M60's more money, and maybe even the Colt or Python give the most since they're the hardest to kill with.
Even if the money is useless, it just makes the scoring more... Accurate. For instance, the guy owning all with a Colt or Stubby should technically have more score than a guy slicing people up with a helicopter. As it stands now, a kill is a kill, rendering the scoring system a little unbalanced, depending on how you want to look at it.