yes, indeed. i think there should be a reward for the participants, but not by performance. We all know some classes are very important for the team and are the only reason that kills are made. That is why i think there should be a better solution as giving a price for the best k/d (or score) would be rather unfair.
any ideas might help. I dont think its a good idea to just give gold to whoever participates, but giving some price to the whole team if they do something might be cool.