The NPCs should be just fillers instead of a penalty. Really, why even have them? Even at my mojo level, ranked 213th currently, there should be plenty of players I can battle. It takes two or three battles to get the same mojo fighting the bots as when fighting another player. I did notice when I was fighting players one of the options would be a very low level character. I chose that one time when it looked like my other two opponents were unbeatable. They give next to nothing as should be expected I suppose. I don't think its a fair system when some are battling players all day while others are having to battle the bots getting only a third of the mojo for winning the same number of fights.